Katanpää Fortress Island

Location of Katanpää Fortress in Finland © Metsähallitus 2005Western Finland, Southwest Finland
Kustavi (www.kustavi.fi)
The area is managed by Metsähallitus.

Katanpää - formerly an island for prisoners and conscripts - has become a valuable cultural historical sight favoured by holidaymakers.

The location of Katanpää was strategically significant for a long time, as from there it was possible to control all three navigation routes running through the Archipelago Sea. Katanpää was used as a naval port as early as the 19th century. The Katanpää fortress is the northernmost part of the largest fortress chain in the Baltic Sea constructed by Nicholas II of Russia in the 1910s.

Photo: Metsähallitus

The old buildings on Katanpää were extensively renovated by the Finnish Defence Forces in the mid-1980s. The fortress is protected under the Antiquities Act and care must be taken when walking in the area - both for personal safety and for the protection of the fortress equipment.

Although Katanpää no longer has any military significance, it is a valuable cultural historical site that is highly valued by boaters. The island has become a destination favoured by holidaymakers, and several thousand visitors per year. Katanpää is the southernmost destination in the Bothnian Sea National Park, which was established in July 2011. 

Contact Information

Directions and Maps

Katanpää can only be reached by water.

Map of the surroundings of Katanpää © Metsähallitus 2005

By Boat

  • On Katanpää (WGS84: N 60° 36.82800' E 21° 10.76460' YKJ: p 6736708m, i 3181699m), there is an excursion harbour, which is 4 metres deep.

By Cruise Boat

  • In the summer Katanpää can be reached by sailing boat from Uusikaupunki. Read more (www.matkailu.uusikaupunk.fi).

By Public Transportation

  • There is no public transport to Katanpää. 

Electronic Maps


  • There is a summer café, restaurant, bed&breakfast, dry toilets, campfire sites and tent site on the island.
  • Renting of kayak
  • At the guest harbour there is a point for emptying septic tanks.
  • There are roads and paths dating back to the active era of the fortress and also two about one kilometre long nature trails. ​

This is the webpage www.nationalparks.fi/katanpaafortressisland

Customer Service

Tel. int. +358 206 39 4620 Mon-Fri 10 am-3 pm

Map of Destination from Excursionmap.fi