Ahlainen (Swedish: Vittisbofjärd) is a former municipality in the province of Satakunta, Finland.

[2] But during the summer, the population is said to double when residents return to the village.

[3] The people of Huittinen originally held the area as hunting grounds, reflected in the Swedish name Vittisbofjärd.

The village and inlet called Keikvesi are named after Keikyä, originally a part of Huittinen.

[4] Soon after Satakunta became part of Sweden, the area of Ahlainen and Merikarvia was settled by Swedes.