The legend holds that, Aritsuna, who had been pursued in Kamakura, took refuge in a limestone cave called "Genzokutsu" at the Nakashiobara hot springs so as to make a comeback.
中塩原温泉には、鎌倉に追われた有綱が再起を図るために潜んでいたと伝わる「源三窟」と呼ばれる鍾乳洞がある。