text: The county is conventionally divided into the traditional districts Follo and Romerike , which fill the vast part of the county , as well as the small exclave west of Oslo that consists of Asker and BÃ rum .
simplified: Most of the county is located in the districts Follo and Romerike . There are also the two smaller districts of Asker and BÃ rum which are located to the west of Oslo .