Korsnäs is a municipality of Finland.
It is located in the province of Western Finland and is part of the Ostrobothnia region.
Korsnäs covers an area of 1,424.71 square kilometres of which 1,189.06 km2 is water.
Korsnäs is the most western mainland municipality in Finland.
It has a long, rocky coastline along the Gulf of Bothnia.
The three largest islands are Halsön, Bredskäret and Södra Björkön, all used as important recreation areas for urban dwellers.
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