Is Land of Stone in Naruto?

The six main lands are:

The Land of Fire - the Hidden Leaf is in this country

The Land of Wind - Hidden Sand

The land of Earth - Hidden Stone

The Land of Water - Hidden Mist

The Land of Lightening - Hidden Cloud

The Land of Sound (formerly Land of Rice Paddies) - Hidden Sound

An easy way to remember the first 5 lands is that each is a 'style' of chakra attack, Examples: 'fire style', 'water style', etc. Sound chakra attacks are not in the main group like the other 5.

There are other, smaller lands named in missions and fillers, like The Land of Bears or The Land of Iron. There are also The Lands of:

Waves, Snow, Sky, Whirlpools, Honey, Hot Water, Tea, Moon...

The list goes on, if you need the rest try Narutopedia: Search for 'Geography'.