Somero is a town and municipality of Finland. It is part of the Southwest Finland region in the province of Western Finland, located 36 kilometres (22 mi) northeast of Salo, 86 kilometres (53 mi) east of Turku and 105 kilometres (65 mi) northwest of Helsinki. The municipality has a population of 8,410 and covers an area of 697.67 square kilometres (269.37 sq mi) of which 29.9 km2 (11.5 sq mi) is water. The population density is 12.59 inhabitants per square kilometre (32.6/sq mi). Somero is unilingually Finnish.

Salo is a town in Finland, located in the southwestern interior of the country. The population of Salo is approximately 51,000, while the sub-region has a population of approximately 60,000. It is the 20th most populous municipality in Finland, and the 24th most populous urban area in the country.