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Place
- Uará, Igarapé Uará, south tributary of Rio Solimões.1
- Uberaba d Baixo1
- Ucayali5
- Umbria4
- Umbría3
- Umbría.1
- Unduavi4
- United States2
- Upper Cupary River, plateau between the Xingu & Tapajos Rivers1
- Upper Demerara-Berbice1
- Upper Machado River region2
- Upper Machado River region, near Tabajara1
- Upper Mazaruni River1
- Upper Mazaruni River Basin, Kako River, below Camp #3 near 'falls' of Kako1
- Upper Mazaruni River Basin, Kamarang River. Frequent in Utschi Falls.1
- Upper Mazaruni River Basin; NE side; Mt. Ayanganna1
- Upper Region Apa River2
- Upper Takutu-Upper Essequibo6
- Uruacu1
- Urubamba1