Marina Sonwik in Flensburg: travel, harbour information and trip destinations

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Marina Sonwik lies on the eastern shore of Flensburg's inner fjord in the Mürwik district, on the site of a former naval base, and has around 360 berths. Here you can read how to travel to your trip departure, where to park and shop, what wind to expect on the fjord, which trip destinations in Germany and Denmark are nearby, and what skippers should know when entering and berthing.

Where is Marina Sonwik?

Marina Sonwik lies in the north of Flensburg on the eastern shore of the inner fjord, on the fjord promenade in the Mürwik district. The harbour basin with its outer breakwater lies in front of the former Mürwik naval base, whose listed buildings now form a residential quarter. It is around 2.3 kilometres to the city centre.

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Flensburg has several marinas. Marina Flensburg, formerly Marina Niro Petersen, lies on the western shore in the Galwik district; the city harbour lies at the harbour head right in the south of the fjord. By car, the route between the eastern and western shores goes around the harbour head. Marina Sonwik is the harbour on the eastern shore in Mürwik; the fuel station on the breakwater already shows you the entrance from the water.

Getting there for trip departure at Marina Sonwik

The following sections accompany you from the airport to the pontoon. If you are travelling as crew: which marina and which pontoon it is will be stated in your trip documents. Because there are several harbours in Flensburg, tell the taxi driver explicitly "Marina Sonwik, Fördepromenade".

From the airport to Marina Sonwik

If you are flying, Hamburg is the nearest large airport, around 135 kilometres away as the crow flies to the south. The S1 takes you to Hamburg main station; it runs every ten minutes and takes around 25 minutes. From there, regional and long-distance trains go to Flensburg, many without changing. The fastest take around one and three-quarter hours. From Flensburg station you take the city bus, as described in the next section.

From Billund in Denmark, around 105 kilometres away as the crow flies to the north, it is best to continue with a hire car. Much closer, around 28 kilometres as the crow flies, lies the small Sønderborg airport on the Danish side of the fjord.

By car, train or bus

By car you reach Flensburg via the A7 from the south and from the north. In the city, drive along the eastern shore of the fjord northwards to the Fördepromenade.

Flensburg is connected to the rail network by regional and long-distance trains via Hamburg and Kiel. From the station to the marina it is around four kilometres as the crow flies. City bus line 5 connects the station and the central bus station (ZOB) with Sonwik: as Ring B it runs from the ZOB directly to Sonwik and on to Engelsby; as Ring A it runs in the opposite direction from the station by a longer route via Campus and Engelsby to Sonwik and back to the ZOB. You can find the current timetable from the city bus operator Aktiv Bus Flensburg.

Parking

Car parks lie on the Fördepromenade directly at the marina. On the site there are also car and trailer parks, some of which are guarded and locked at night. At night the harbour is also closed from the landward side.

Showers and sanitary facilities

The marina has two sanitary blocks with showers in the harbour, plus accessible facilities. Washing machine and tumble dryer are also available.

Shopping for the trip

The nearest supermarket is a PENNY supermarket on Am Stadion street, around 800 metres from the marina. Around one kilometre away is a REWE supermarket with a larger range. You can reach both on foot; with crates of drinks for a week's sailing trip, the car is more convenient. You can reach larger supermarkets by car: Edeka Friedrichsen lies around 1.2 kilometres to the northeast, famila around 2 kilometres to the southeast.

In the harbour there is a morning bread roll and newspaper service, plus a kiosk and waterfront dining.

Doctor, pharmacy and emergency services

The nearest pharmacy is the Förde-Apotheke, around 550 metres from the marina. Around one kilometre away is the Blasberg-Apotheke. You can find the pharmacy emergency service on 0800 00 22833, from a mobile on 22 8 33.

The Malteser Fördeklinikum St. Katharina, Knuthstraße site, at Knuthstraße 1 on the western side of the city, has an accident and emergency department.

• 112: ambulance and fire brigade, in Germany and in Denmark
• 110: Police
• 116 117: medical on-call service when GP surgeries are closed
• On the water: Maritime Rescue Co-ordination Centre of the German Maritime Search and Rescue Service (DGzRS) in Bremen, call sign "Bremen Rescue", on VHF channel 16 or by DSC on channel 70, 24 hours also on telephone +49 421 53687-0

What does Marina Sonwik offer?

Marina Sonwik accommodates yachts up to around 30 metres in length and 5 metres draught; visiting yachts pay according to boat length. Key details at a glance (as of October 2026):

Feature	Details
Position (approximate)	54° 48,6′ N, 009° 27,2′ E
Location	Fördepromenade, 24944 Flensburg-Mürwik, eastern shore of the inner fjord
Operator	Flensburger Yacht-Service GmbH & Co. KG
Berths	around 360, pile moorings, finger berths and buoys
Boat size	up to around 30 m length and 5 m draught
Berthing fee for visiting yachts per day	€20 up to 8 m, €25 up to 10 m, €30 up to 12 m, €35 up to 15 m, €50 up to 17 m, €75 up to 20 m; catamarans 1.5 times the rate
Hafenmeister	+49 461 5050450, mobile +49 170 7628869
Booking	sonwik@fys.de, +49 461 17727-45
Fuel	Diesel, fuel berth at the harbour entrance, 24 hours
City centre	about 2.3 km

One week costs as much as six nights. The full list is in the Marina price list.

Equipment

Electricity is available at most pontoons directly at the berth, drinking water at around 90 taps. Guests have free Wi-Fi, the pontoons are lit at night. At the harbour entrance there is a fuel berth where you pay by card around the clock. You can exchange gas bottles in the harbour, dogs are permitted.

The harbour operator has its own boatyard with crane and over 8,000 square metres of winter storage. In the harbour there is a travel lift up to 3 tonnes and a slipway with winch. Engine servicing, sailmaker and chandler are on site. You can hire e-bikes in the harbour, there is a hotel right on the water.

What wind can you expect on Flensburg Fjord?

In the western Baltic Sea the wind usually comes from the west and south-west. In summer it blows more lightly on average and more frequently from the north-west; in autumn and winter it freshens more often and veers more strongly to south-west. For the coast the Deutscher Wetterdienst issues a wind warning from force 6 and a gale warning from force 8.

The inner fjord as far as Holnis narrows is well sheltered; with easterly winds beyond that on the outer fjord there is an uncomfortable sea. Tides play hardly any role, water levels are moved mainly by wind, at Sonwik by up to 1.5 metres: persistent easterly or north-easterly winds push water into the fjord, strong south-westerly winds cause it to fall.

In late spring, when warm air moves over the still-cold water, sea fog forms and visibility can drop suddenly.

Which destinations can you reach from Marina Sonwik?

From Marina Sonwik, German and Danish harbours around the fjord are within a day's sail. You can reach the Schlei and Dyvig in the north of Als with a long day's sail.

The distances are rounded water routes on the usual course from Marina Sonwik; for precise planning the chart applies.

• Glücksburg: around 4 nm, on the eastern shore of the inner fjord just before Holnis narrows.
• Langballigau: around 9 nm, small harbour on the German outer fjord.
• Gråsten: around 9 nm, on the Danish north shore of the fjord.
• Sønderborg on Als: around 16 nm.
• Dyvig in the north of Als: around 28 nm, through Alssund.
• Maasholm at the Schlei mouth: around 29 nm.
• Kappeln on the Schlei: around 32 nm.

A week's sailing trip can lead via Sønderborg and Alssund to Dyvig and back along the outer fjord, or south to the Schlei. Further south at Kiel Fjord we present the Laboe Marina .

What can you do on a harbour day at Sonwik?

The waterfront paths in Mürwik and Flensburg city centre are within walking distance or cycling distance from the marina; half a day is enough for the old town.

Former naval base Mürwik

The brick buildings around the harbour basin were part of the former naval base and are listed monuments. Today people live here right on the water, and the fjord promenade invites you to a walk with views across the inner fjord.

Water tower in Volkspark

The Mürwik water tower stands in Volkspark. Its viewing platform is 26 metres above the ground and leads all the way round the water tank; you can reach it by stairs or lift. It is open from 1 May to 30 September, Wednesdays to Sundays from 11 a.m. to 1 p.m. and 3 p.m. to 6 p.m., admission is free.

Marineschule Mürwik

About one kilometre north-east of the marina lies the Marineschule Mürwik, the naval officers' training establishment since 1910. Because of its red brick construction it is also called the "Red Castle by the Sea". The grounds are not open to the public; on open days and during events you can visit parts of the main building and the tower with views over Flensburg, usually with an identity card.

Old town and Historischer Hafen

About 2.3 kilometres south-west lies the city centre with the old town, Historischer Hafen and maritime museum on the western shore. What you can do there on a harbour day is described in our profile of the Marina Flensburg.

For skippers: Berthing and sea weather at Marina Sonwik

At Marina Sonwik you berth in pile-mooring boxes, at finger pontoons or on mooring buoys. You can reach the harbour master on +49 461 5050450.

Registration and Berthing

Visiting boats can book a berth in advance by e-mail to sonwik@fys.de, by phone on +49 461 17727-45 or via the Boatpark app. Whether a berth is free is shown by red and green signs at the berth: green means free. There is also a reporting pontoon for registration.

The harbour master is available Mondays to Fridays from 4 p.m. to 5 p.m., and at weekends and public holidays from 8 a.m. to 9 a.m. and from 5 p.m. to 6 p.m. The harbour does not give its own VHF channel; you can reach the harbour master by phone.

A pile-mooring box is bounded on both sides by two piles; you make fast with bow or stern to the pontoon. Before entering, lay out long lines with large eyes for the piles on both sides and hang out fenders.

Approach

You can approach the marina by day or night without difficulty; the fjord is marked with buoys and lit. Coming from the north, from buoy 15 onwards take a south-south-easterly course straight towards the entrance, where the fuel station lies. Reckon with a current of up to 0.8 knots in front of the entrance.

Border with Denmark

The border with Denmark runs approximately down the middle of the fjord. As both countries belong to the EU and the Schengen Area, you do not have to declare goods for personal use to customs. Everyone on board needs a valid identity card or passport for the trip.

Which sea area forecast covers Flensburg Fjord?

The sea weather forecast from the German Weather Service (DWD) for the North Sea and Baltic Sea applies, together with the DWD coastal warnings for the section Flensburg to Fehmarn. For the fjord the sea area Western Baltic is relevant, for trips to Als and further into Denmark additionally Belts and Sound.

You can read the current report on the DWD sea weather page or in the WarnWetter app. Whilst underway you receive it via VHF coast radio, NAVTEX and on the radio. If your course leads through the Holnis narrows out onto the outer fjord, keep a particular eye on winds from the east.

Trips from Marina Sonwik on Törnfinder

In October 2026 there are 4 trip dates on Törnfinder over the next twelve months with departure or destination Marina Sonwik. Most depart in May, July and September; typically they are 8 days.

All current offers are in the trip overview. An overview of the whole sailing area is on the Sailing in the Baltic Sea; trips in Danish waters you will find at cabin charter in Denmark.

Frequently asked questions

How do I get from Flensburg station to Marina Sonwik?

City bus line 5: Ring B runs from the bus station directly to Sonwik, Ring A from the railway station by a longer route via Campus and Engelsby. As the crow flies it is about four kilometres from the station.

Where do I park at trip departure at Marina Sonwik?

In the car parks on Fördepromenade directly at the marina. On the site there are also spaces for cars and trailers, some guarded at night.

Are there showers at Marina Sonwik?

Yes, in two sanitary buildings in the harbour, plus accessible sanitary facilities, washing machine and dryer.

Where is the nearest supermarket to Marina Sonwik?

A PENNY supermarket is about 800 metres away on Am Stadion, a REWE supermarket about one kilometre. Rolls are available in the morning at the harbour.

Is Marina Sonwik the same as Marina Flensburg?

No. Marina Sonwik lies on the eastern shore of the fjord in Mürwik, Marina Flensburg, formerly Marina Niro Petersen, on the western shore in Galwik. As the crow flies the two are about two kilometres apart; by car you go round the head of the harbour.

How much does a visitor berth in Marina Sonwik cost?

For a yacht up to 12 metres you pay €30 per day, up to 10 metres €25. A week costs the same as six nights; catamarans pay 1.5 times the rate.

Can you refuel at Marina Sonwik?

Yes, there is diesel available around the clock at the fuel dock by the harbour entrance; payment is by card.