The municipality had a population of 1,959 (30 November 2014)[2] and it covered an area of 102.41 square kilometres (39.54 sq mi) of
which 0.45 square kilometres (0.17 sq mi) was water.[1] The population density was 19.21 inhabitants per square kilometre (49.8/sq mi).
The name part joki means "river". The Tarvas part of the name originally referred to wild animals that were hunted, for example aurochs (wild cattle) and roe deer.[3]
