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81. Uruturukeng River (4.17N, 59.17W) Potaro-Siparuni, Stream 82. Ushawau River (3.05N, 59.53W) Upper Takutu-Upper Essequibo, Stream 83. Utrecht (6.73N, 58.15W) Demerara-Mahaica, Estate(s) 84. Utshi River (5.73N, 61.03W) , Stream 85. Uwaika River (4.65N, 59.45W) Potaro-Siparuni, Stream 86. Uwalka River (4.65N, 59.45W) Potaro-Siparuni, Stream |