Vestfold is Norway's smallest county, with the exception of the city-county of Oslo. It lies on the western shore of the Oslofjord. Vestfold borders with Buskerud County in the north and with Telemark County in the west. It is bordered by Skagerrak in the North Sea to both the south and east. The county has a total area of and has a coastline. Vestfjellet at is the tallest peak in the county. It is also home to 1,407 islands. Nøtterøy () is the largest island in Vestfold, while Tjøme () is the second-largest island.