underwater
upwelling
undertoe
umbrella
The Uwakai Sea is in Japan. It begins with the letter U.
Ural River
Unicorn Fish is a fish. It begins with the letter U.
No sea begins with the letter X.
The South China Sea begins with the letter S. The Sea of Japan and the Sea of Okhotsk also begin with the letter S.
Ugli fruit begins with the letter "U".
The Aegean Sea.
Halmahera Sea
Caspian sea (:
The Indian Sea
Uvilla is a fruit. It begins with the letter u.
Events that starts with letter u