A ditch that is found on the southeast side of the rounded rear on the survey map is supposed to be associated with a teahouse that was run by a choja (millionaire), Hashinaka, around the foot during the Edo period.
また、後円部南東の側面に測量図で溝が見られるのは、そのふもと近辺に江戸時代、箸中長者の経営する茶店がありその影響とも思われる。