The 770 kilometer (479 mile) long border between Zambia and Zimbabwe was initially established as an internal British colonial frontier in 1963. The boundary follows the Zambezi River as it flows east through Victoria Falls and Lake Kariba. The westernmost point of the boundary lies in the quadripoint area shared with Namibia and Botswana. To the east, the border ends at a tripoint with Mozambique. While there have been no bilateral border agreements between Zambia and Zimbabwe, the two governments are currently working towards resolving several disputed islands in the Zambezi River.