high waterfalls on the Guyana-Venezuelan border. They spring from a table mountain, Kukenaam (8,620 feet 【2,627 m】), to the northwest of Mount Roraima (9,094 feet) and are the beginning of the Cuquenán River, a tributary of the Caroni River. The falls have a 2,000-foot (600-metre) drop, one of the highest drops in South America.