The port of Kristiansand lies on a height and almost square isthmus in the Skagerrak at the mouth of the Torridalselv the lower course of the Otra. The township, founded by Christian IV in 1641, was destroyed by fire on numerous occasions in succeeding centuries, and was reconstructed on a regular lattice plan. Kristiansand is the chief township of Vest-Agder county and the sea of a bishop. Its chief sources of employment are industry and shipping. Kristiansand is the site of the Quart Festival each year in July, Kristiansand Zoo and Amusement Park and the University of Agder's biggest campus.