How many different countries does the 4,370 km (2,715 mi) Congo River run through or border?
China–Kazakhstan border by joint commissions. According to the commissions' protocols and maps, the two countries' border line is 1782.75 km long, including 1215.86 km of land border and 566.89 km of border line run along (or across) rivers or lakes. The commissions' work was documented by several joint protocols, finalized with the Protocol signed in Beijing on May 10, 2002. In 2011 a cross-border free trade area opened on the border at Khorgos in an effort to boost Chinese-Kazakh trade. The two countries' border protection authorities carry out regular meetings, and on occasions even joint border patrols. China–Kazakhstan border The China–Kazakhstan border,
Tijuana River flood control, and U.S. border protection. The Tijuana River rises in the Sierra de Juárez of northern Baja California, approximately 45 mi (70 km) ENE of Ensenada. It flows WNW through Tijuana, crossing the border approximately 5 mi (8 km) from the Pacific. It flows west, just skirting the international border south of the San Ysidro section of San Diego. The lower 2 mi (3 km) of the river form the broad mud flat estuary, and the Tijuana River Estuary is a rich habitat for wildlife, including over 370 species of birds; one of these species is the Ridgway's rail.