A very large archipelago with numerous islands lying offshore of Luvia and Rauma. The central archipelago of Raumahas many very large forested and inhabited islands with smaller islands and islets to its north and south. The other main area is the Luvia archipelago, comprising over 400 islands, most of which are rocky and stony and 0.4-4 ha in size. The larger islands of this archipelago are covered by Picea-dominated old forests, belts of Juniperus and Hippophae, and low heaths.
An important area for island-breeding birds.
Pressure/threats to key biodiversity
Condensation water from a nuclear plant impacts on the area. The large, isolated island of Säppi within the IBA has a longstanding bird-ringing station where exceptionally large numbers of waders have been ringed. Part of the area is a candidate SAC.
National Low International Partial121 ha of IBA covered by Protected Area on Private Lands (Omenapuunas, 112 ha; Reksaari, 4 ha; Pihlasenokka, 4 ha; Puuvallinnokka, 4 ha; Kylmäsantakari, 7 ha; Hylkikartta, 3 ha; Marjakari-Pohjoiskallio, 8 ha). 14,041 ha of IBA covered by Special Protection Area (Luvian saaristo).