Akershus, with more than half a million inhabitants, is the second-largest county by population after Oslo county. The county is named after Akershus Fortress, which is the fortress of the harbor of Oslo. The county administration is in Oslo. Apart from being one of the fastest-growing municipalities in Akershus, it is also the largest agricultural municipality of Akershus, and home of the Norwegian University of Life Sciences and the amusement park Tusenfryd. There are many hiking and sightseeing spots around Asker, such as Semsvannet lake and Drengsrud cultural path around the area.