Located in the north-west region of Gunma Prefecture, Higashiagatsuma-machi is a town of lush greenery surrounded by mountains reaching heights of nearly 1,000 meters.. Mount Iwabitsu, a rugged mountain towering nearby, is home to the ruins of Iwabitsu Castle, where Warlord Sanada Nobushige (Yukimura) is believed to have spent his childhood. Nature’s wonders also await you. Agatsuma Valley is known for its beautiful vistas. Hakoshima Fresh Water Spring has been selected as one of the best 100 spring waters in Japan. And the fireflies nurtured by the crystal-clear water have become symbols of the purity of the local nature.