The 1,423 km boundary between Mozambique and Zimbabwe was established in the colonial period by Portugal and the United Kingdom. It runs in a generally north-to-south direction, mostly following straight lines between boundary markers connecting riverine sections. After an initial and somewhat problematic delimitation in 1891, leading to multiple revisions, the modern-day boundary was established by three Exchanges of Notes in 1911, 1912, and 1940. The 1911 Agreement refers back to a 1905 demarcation effort, and the 1940 Agreement makes use of the work of several preceding demarcation commissions to resolve discrepancies along the southern end of the border. Mozambique and Zimbabwe do not dispute their boundary.