Cassiquiari

kas-se-ke-a're, a unique river of Venezuela. It branches off from the upper Orinoco, taking nearly half of the water of that stream, and flows westerly over 100 miles into the Rio Negro, one of the main tributaries of the Amazon. The Cassiquiari is a deep, rapid, navigable stream. With the Rio Negro it forms a continuous waterway between the Amazon and the Orinoco. See Amazon; Orinoco