Land of Waves

From Narutopedia

The Land of Waves (波の国, Nami no Kuni) is a relatively poor nation, and thus does not have a hidden village. It is an isolated island, but used to be prosperous nonetheless, until Gatō set his sights on it. He broke the people's will and monopolized the import/export industry, which was crucial for its economy. Team 7's first real mission was to this country, and, with the help of Zabuza Momochi and the townspeople, Gatō's reign of terror was ended for good. Afterwards, a bridge was built to connect the country to the Land of Fire.

Sasuke Uchiha briefly visits the country in Part II.