Turks Island Passage — Atlantic Ocean
Tyrol, South — Italy
Tyrrhenian Sea — Atlantic Ocean
U
Udorn (Udon Thani) [US Consulate] — Thailand
Ulaanbaatar [US Embassy] — Mongolia
Ullung-do — Korea, South
Unimak Pass [strait] — Pacific Ocean
Union of Soviet Socialist Republics Armenia, Azerbaijan, Belarus,
[the former USSR] — Estonia, Georgia, Kazakhstan,
— Kyrgyzstan, Latvia, Lithuania, — Moldova, Russia, Tajikistan, —
Turkmenistan, Ukraine, Uzbekistan