On Karowrieng River upstream from confl. with Mazaruni River, and landing on N bank of Karowrieng near base of first impassable falls (5°40'37.2"N, 60°17'4.2"W, 485m; to rapids 5°40'27.0"N, 60°16'19.8"W, 492m), Cuyuni-Mazaruni, Guyana, South America - Neotropics