There are for sure more than the big five nations. I never watched a single episode of narutoNaruto, but I will try to provide aan answer here. You only ask for the nations, but I will add a list of the villages too.
This map is made by xShadowRebirthx. This is not a official map and also some places could be differ from the original! Click on the image to enlarge the map.
The countries in Naruto operate as separate political entities and are presumably all monarchies, ruled by feudal lords who stand equally in rank with the hidden villages' leaders.
The great five countries
Five of the countries are considered to be the most powerful and infuentialinfluential of them all.
The country is mostly comprised of desolate, rocky areas. The border
of the Land of Earth runs along a rocky mountain range, blocking
communication with other countries. The wind blowing from the north
passes over these mountains, carrying small rocks from the Land of
Earth to the surrounding countries.
The Land of Fire is appropriately oriented towards the element of
fire, typically having very bright and warm weather. While not the
physically largest country, it has the largest hidden village.
In the centre of the country are vast mountain ranges, whose many
thunderstorms are said to give the country its name. From these
mountain ranges, many rivers flow to the sea, creating a very crooked
coastline that displays an impressive oceanic beauty. There are many
hot springs located within the country.
The country's weather is typically cool and the islands are usually
covered by mist. The islands themselves also feature many lakes. The
nation is oriented towards the element of water.
The country covers a vast realm, but that realm is largely composed of
deserts. Because there is very little rainfall throughout the year,
the people of the country live in villages built on one of the
desert's many oases. Despite the country's extremely harsh
environment, it has a large population.
So there are all countries listed, here are four more
- Land of Iron
- Land of Snow
- Land of Sound
- Land of Sky
Minor countries
Benisu Island, Bean Jam, Bears, Birds, Claws, Demons, Fangs, Forests, Honey, Hot Water, Keys, Mountains, Neck, Noodles, Rivers, Sand, Stone, Swamps, Tea, That, This, Valleys, Vegetables, Whirlpools, Woods, Moon, Sea, Rōran
Shinobi Villages/Hidden Villages
Shinobi villages, or also called hidden villages, are ninja villages that serve as the military force for their country.
In sumsummary, there are the 5 big nations, the 4 smaller one wichwhich make 9 nations. The minor countriesThere are 28 minor countries and 31 the hidden villages are 31.
Most of the informationsinformation are from the Narutopedia. Other information from the frozen site narutoarikiri. A cached version is avableavailable here.