Administrative definition: province of Länsi-Suomi 1997-2009Linguistic definition: the areas 1, 2 and 3 on the map. Western dialects are also spoken in the areas 4 and 5, but they are usually considered to belong to Northern Finland
a region comprising the western parts of Finland; not a well defined area, but roughly equaling the area that lies west of the line that connects Kokkola and Hanko, overlapping with Etelä-Suomi(“Southern Finland”) in the south
(linguistics, culture) those parts of Southern Finland in which the so called western dialects are spoken (see map)
(government) a former (1997-2012) province (lääni) of Finland