Demerara (dĕmərârˈə) [key], river, c.200 mi (320 km) long, rising in the Guiana Highlands, E Guyana, and flowing N to the Atlantic Ocean. Georgetown, Guyana's chief port, is at the river's mouth. The Demerara is navigable for oceangoing vessels to Mackenzie, an important exporting center for bauxite and kaolin.
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