By boat
Svartholma Sea Fortress is situated in Loviisa in Eastern Uusimaa, about 10 kilometres from the city of Loviisa, i.e. 45 minutes away by boat.
Location of the free-of-charge visitors' berth: 60°22,8'N 26°18,1'E (WGS 84 coordinate system).
- Nautical chart series A, nautical chart 615, harbour number 194.
- Depth of fairway at the visitors' berth: 1.0–3.9 metres.
- Number of berths: 70.
- Buoy, boom and side mooring.
- From the lit route to Loviisa, turn east along the signposted route to the visitors' berths on the eastern shore of the island.