Båsa is a village in Raseborg Municipality, in the region of Uusimaa, Finland. Båsa lies at 31 m above sea level. The nearest city is Kirkkonummi, 40 km to the east. Beaches nearby: Björkudden (13 km), Langasbölenranta (14 km). Among the landmarks around are Raseborg Castle (7.2 km), Grabbacka (8.3 km) and Saint Nicholas Church (13.8 km). Among the natural features are Plitorna (4.4 km) and Mörholmen (6.0 km).