Brazil–Colombia border



The border between Brazil and Colombia is 1644.2 km long. The boundary was delimited in two treaties:
 * the Vásquez Cobo-Martins treaty of 1907, establishing the line from the Rio Negro northwestward along the Amazon River-Orinoco watershed divide, "then generally southward along various river courses and straight-line segments to the mouth of the Apaporis River", and
 * the Tratado de Límites y Navegación Fluvial of 1928, delimiting the Apaporis-Amazon segment of the boundary as a "geodesic line identical to its Brazilian-Peruvian antecedent after Colombia gained undisputed sovereignty over the area".

Border towns

 * 🇧🇷: Tabatinga, Benjamin Constant, Lauarete, Vila Bittencourt, Ipiranga, Cucui.
 * 🇨🇴: Leticia, Tarapacá, La Pedrera, Mitú, Taraira, Yavaraté, La Guadalupe.