Rio Negro

The Rio Negro (Portuguese: Rio Negro, Spanish: Río Negro, actually Black River) is the biggest left-financial institution tributary of the Amazon River and the biggest black-water river withinside the world. This is one of the longest rivers in Venezuela. It's 2,250 km in length.The river originates on the watershed among the Orinoco and the Amazon basin, and is likewise related to the Orinoco River via means of the Casiquiare Canal in southern Venezuela. In Colombia, wherein the Rio Negro originates, the river is known as Guainía. Its one predominant tributary is the Vaupés, which competes with Orinoco's Guaviare, and is the drainage gadget of the jap slopes of the Colombian Andes. The Rio Negro flows to the Rio Solimões and joins the Amazon River south of Manaus, Brazil.

The Rio Negro is navigable seven hundred kilometers from the estuary, with simplest one meter of water withinside the dry season and lots of sandbars and river beds growing positive difficulties. A small part of the river's float paperwork is a phase of the border between Colombia and Venezuela.

During the wet season, floods are regularly lengthy and wide, every so often as much as 30 kilometers (19 mi) wide, and 650 kilometers (four hundred mi) upstream. During this period, from April to October, the river creates a sequence of lagoons, lengthy islands and complex channels inclusive of Santa Isabel do Rio Negro. The foothills of the Andes start simply earlier than attaining the confluence with the Vaupés River. In this place, the Negro River narrows and the water stage rises with many massive rocks and the river flows violently to conquer the rapids and whirlpools. Despite the obstacles, canoe and engine down can pass São Gabriel da Cachoeira to the Andes.

Length: 2,250 km