The land boundary between Botswana and Zimbabwe is 841 kilometers (523 miles) long, from the tripoint with Zambia in the northwest to the tripoint with South Africa in the southeast. The frontier follows a variety of features, including the Shashe River and a colonial road. The portions of the boundary extending over land were demarcated during the early colonial period and again in 1959. While there are no official boundary disputes, the two nations have a history of strained relations with recent signs of improvement.