In the Naruto world, countries operate as separate political entities ruled by landlords. Within these countries are hidden villages (隠れ里 kakurezato), settlements housing ninja, warriors capable of using supernatural abilities in combat. A hidden village maintains the economy of the parent country by training ninja from a young age and using them to perform missions for other countries. The ninja of a hidden village also serve as the military force of their parent country. The leaders of the hidden villages hold equal status with the leaders of their respective countries. Five countries in the Naruto world: the Land of Earth, the Land of Fire, Land of Lightning, the Land of Water, and the Land of Wind are known as the "Five Great Shinobi Nations". These countries are the most powerful in the Naruto world. They are ruled by a feudal lord and the leaders of the hidden villages in these countries hold the title of Kage. Other apparently smaller nations have been named in passing, in either the manga or anime, but are yet to be explored.