Naegi Castle was a Japanese castle that formed the administrative center of Naegi Domain, a feudal domain of the Tōyama clan, located in what is now part of the city of Nakatsugawa in Gifu Prefecture, Japan. It also referred to as Fog Castle , Naegi Castle was also known as "Akakabe Castle", as it’s walls were not white like many Japanese castles, but made with a reddish colored clay. The site has been protected as a National Historic Site since 1981.