Alaska
Îles commençant par u
États-Unis
- Ubi Island
- Uchixsax
- Ugaiushak Island
- Ugak Island
- Ugak Island
- Ugalux
- Ugamak Island
- Uganik Island
- Ugidak Island
- Ukolnoi Island
- Ukolnoi Rocks
- Ulak Island
- Ulak Island
- Uliaga Island
- Ulinoi Island
- Ulloa Island
- Umak Island
- Umga Island
- Umla Island
- Umnak Island
- Unalaska Island
- Unalga Island
- Unalga Island
- Unavikshak Island
- Unga Island
- Ungluchin
- Unglulagan
- Ungluugamax
- Unglux
- Unguchiing Achidan Tanangis
- Unguchiing Hachan Tangingis
- Unimak Island
- Unishka Island
- Unlucky Island
- Urilof Island
- Ushagat Island
- Uski Island
- Utesistoi Island
- Uuyax
- Uyak Island
- Uzamkum-tanasuu