Salla, known as Kuolajärvi until 1936, is a municipality of Finland, located in Lapland. The municipality has a population of 3,285 and covers a…Salla, known as Kuolajärvi until 1936, is a municipality of Finland, located in Lapland. The municipality has a population of 3,285 and covers an area of 5,873.08 square kilometres of which 142.73 km² is water. The population density is 0.57 inhabitants per square kilometre.