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.