Örö is in a large island in the Archipelago Sea national park in Finland. It is quite easily reachable – a one hour ferry trip from Kasnäs in Kimitoön through the inner archipelago – but still more or less by the open sea, and its sandy shores and meadows provide biotops seldom found in the rest of Finland. The landscapes are nice and there are smooth cliffs and beaches with fine sand. Many of the visitors also come for the military history.

While most services in Finnish national parks are handled by Metsähallitus, in Örö they are left to private partners. Camping, seeing the sights and walking around is still free on Örö.

The island used to be a common pasture for the villages of Hitis-Rosala. There were huts used as a base for fishing expeditions and other overnight stays. The sheltered waters were also used as temporary anchorages for naval vessels.

This changed when the Russians built a fort on the island 1910–1915, as part of the "Peter the Great" chain of fortifications defending the Gulf of Finland and thereby Saint Petersburg (similar forts where built at Russarö and Utö, and in Estonia). When Finland became independent in 1917 it became part of the Finnish defense and construction works continued.

The fort was modernized in the 1930. In the Continuation War 1941–1944 the Soviet marin base in Hanko (leased as part of the Winter War peace treaty 1940) was within range for the heavy batteries. Örö also provided supporting fire in the battle of Bengtskär.

The coastal forts, and their artillery, long had an important role in Finnish coastal defence, but finally they were decommissioned. The island still remained a military area, used for training and supervision, until 2015, when it became part of the national park and opened for tourism. Some military installations are still in use and off limits for visitors.

Being off limits for the public and used for military purposes has protected many otherwise threatened natural features. As a former training area for conscripts, it also has nostalgic value.

The large island (200 ha, 1.5 km·3 km), surrounded by smooth cliffs, is a mostly forested sandy reef with low bedrock hills. The most precious habitats on Örö are the scorched heathlands and the sandy beaches.

In season there are daily ferry connections from Kasnäs in the southwest end of Kimitoön. Advance reservations recommended. Note that the the tickets are valid only on the vessel for which they are bought (different companies). 28.5–31.8.2016:

• M/S Sissel, ☏ +358 50-551-4266, [email protected]. Daily 10:00→10:45. Back 15:05→15:50. €16/8 single, €24/12 return. (updated Jun 2016)
• M/S Ejskär, ☏ +358 40-777-3668, [email protected]. Tu,W,F–Su 10:45→12:00; daily 19:15→20:30. Back Tu,W,F–Su 09:00→10:15; daily 17:15→18:30. €16/8 single, €24/12 return. (updated Jun 2016)
• M/S Stella, ☏ +358 40-675-6441, [email protected]. M 11:45→12:45 if cargo, otherwise by Ejskär; Th 11:00→12:00. Back M 13:30→14:30, unless no cargo in the morning; Th 13:30→14:30. €16/8 single, €24/12 return. (updated Jun 2016)
• Sailing ship Eugenia, ☏ +358 440-427-862, [email protected]. Once or twice a week in the summer from Kasnäs (start 10:00, back 17:30) or Dalsbruk (09:00, back 18:00). Return trip with the traditional sailing vessel Eugenia (replica of a 19th century one-masted coastal freighter), including lunch and guided tour. Groups (2–34 persons) can ask for other routes and dates. €48–54, children 4–12 €25. (updated Jun 2016)

There are few buses to Kasnäs, and they do not necessarily combine with the Örö ferries. Connections to Dalsbruk are better, with a few services a day e.g. from Turku (1¾ hours, €17), Salo (1½ hours, €15) or Helsinki (3 hours, €36). Take a taxi (or your bike) from Dalsbruk, 20 km.

With private vessels the guest harbour, where also the ferry quay is situated, is the only allowed entry point, unless the harbour master assigns other moorings (as sometimes in peek season). There is a landing spot also for canoes.

• 59.810522.33581 Guest harbour, ☏ +358 40-775-5625, [email protected]. June–August daily 08:00–21:00; May, September Fri-Sun; April, October with weather reservation. Facilities include septic tank emptying, toilet, shower, water, washing facilities, café and sauna. Mooring between booms, side berthing for bigger vessels. Open for northeasterly winds. Nautical chart 644, chart series B (Western Gulf of Finland). Harbour draught 3.0 m. €26/boat/night. (updated Jun 2016)

There are no entry fees, but you need to pay for transport or mooring. There are non-free services such as lodging, bike rental, guiding, a restaurant and a café.

Anchoring is forbidden. Landing is allowed only at the guest harbour or as instructed by the harbour master.

Scuba diving is forbidden, except with special permits.

Minor areas are still used by the military and off limits.

Butterfly traps and other research equipment is to be left alone.

The sandy beaches and some other features are sensitive. Avoid causing damage.

There is livestock on the island. Do not feed or disturb. Do not disturb wildlife either. Dogs must be kept on leash everywhere and are not allowed in the pastures.

There are old cobbled roads providing easy access across the island, and some trails showing batteries, barracks and nature. Deviating from roads and trails is allowed, but should be avoided. All important sights can be accessed by the trails.

There are bikes for rent (use on roads only): €8 half day, €16 whole day. Using motorized vehicles is not allowed.

Kayaks for rent, €25.

The harbour is near the east end of the island, 0.5 km from the restaurant. The 12" battery and most lodgings are near the restaurant. The camping site is a further 0.5 km from the harbour, as are some lodgings. The beach is near the southern tip, 1–1.5 km (depending on route) from the camping site.

• 12" batteries. The heavy 12" (30cm) cannons had a range of 45 km. The impressive pieces have barrels weighting 50 tonnes (which would be replaced after a certain amount of firing). (updated Jun 2016)
• Other fortifications and infrastructure.
• The landscapes.
• Archipelago woods.
• Sunny meadows.
• Sand and gravel beaches.
• Flora and fauna, especially butterflies and dragonflies.

• For swimming, use the designated beach.
• Sauna available.
• Guided tours, daily in Finnish in season, but private guiding in at least English and Swedish are available on request and can be tailored to your interests.
• Games, such as mölkky and krocket for rent by the restaurant.

• Some souvenirs for sale.

• 12" restaurant, ☏ +358 45-613-3940, [email protected]. June–August daily: lunch 11:00–16:00, dinner 17:00–; May and September by agreement. The restaurant is the former garrison's canteen, built in the Russian pre-WW1 times. (updated Jun 2016)
• Harbour café, also meals.
• The apartments and cottages have kitchens.
• Barbecue in the harbour. Using portable stoves allowed, disposable grills and open fire prohibited.

Accommodation in cottages (private or shared), at a campsite or in your yacht in the guest harbour.

There are several options for lodging: rooms, apartments, cottages, guesthouse, dormitory.

Camping is allowed at the campsite in sparse forest. Dining shelter. Privy.

Backcountry camping is not allowed.

Old defense structure, such as trenches and foxholes, are sometimes well hidden. Watch your step.

Although the island has been cleared from dangerous military materials, there may be individual pieces left. Do not touch things you might find.