- a vast tropical region in NE South America, bounded by the Orinoco, Negro, and Amazon rivers and the Atlantic. About 690,000 sq. mi. (1,787,000 sq. km).
- the coastal portion of this region, which includes Guyana, , and Suriname. 175,275 sq. mi. (453,962 sq. km).
- a region of NE South America, including Guyana, Surinam, French Guiana, and the Guiana Highlands (largely in SE Venezuela and partly in N Brazil). Area: about 1 787 000 sq km (690 000 sq miles)