Nagano Prefecture (長野県 Nagano-ken) is a prefecture of Japan located in the Chūbu region of the island of Honshu.
The capital is the city of Nagano. Due to the abundance of mountain ranges in this area, the land available for inhabitants is relatively limited.
Nagano is an inland prefecture and it borders more prefectures than any other in Japan. Nagano contains the point furthest from the sea in the whole of Japan – this point lies within the city of Saku. The province’s mountains have made it relatively isolated, and many visitors come to Nagano for its mountain resorts and hot springs. Nine of the twelve highest mountains in Japan can be found in Nagano and one of its lakes, Lake Kizaki, is a beach resort popular for its water attractions and games.
As of 1 April 2012, 21% of the total land area of the prefecture was designated as Natural Parks.