From the Wikipedia page 
Västra Götaland County (Swedish: Västra Götalands län) is a county or län on the western coast of Sweden.
The county is the second largest (in terms of population) of Sweden's counties and it is subdivided into 49 municipalities (kommuner). Its population of 1,616,000 amounts to 17% of Sweden's population.[needs update] The formal capital and seat of the governor of Västra Götaland County is Gothenburg. The political capital and seat of the Västra Götaland Regional Council is Vänersborg.
The county was established in 01 January 1998, when Älvsborg County, Gothenburg and Bohus County and Skaraborg County were merged.
Västra Götaland was created in 1998 by a merger of the three former counties of Gothenburg and Bohus County, Älvsborg County and Skaraborg County. The seat of residence for the Governors or Landshövding is Gothenburg, while the seat of political administration and power is Vänersborg. The Governor is the head of the County Administrative Board or Länsstyrelse.
The Västra Götaland Regional Council or Västra Götalandsregionen is an evolved County Council that for a trial period has assumed certain tasks from the County Administrative Board. Similar trial councils are applied for Skåne County and Gotland County.