The 1,583 kilometer (984 mile) boundary between Botswana and Namibia runs generally north-to-south, and then east-to-west, following straight lines and rivers. Where the boundary follows straight lines, it has been clearly demarcated. In the northeast, the boundary ends at a tripoint with Zambia, and in the southwest, the frontier terminates in a tripoint with South Africa. The two States resolved a historic boundary dispute over island sovereignty in the Chobe River at the International Court of Justice in 1999. Since then, the boundary has remained undisputed, and the two countries have positive relations. In February 2018, Botswana and Namibia signed a new boundary treaty that reaffirmed the colonial delimitation and called for additional demarcation.