Tonoguchi Weir Cave looks like a small spring, but it is part of an old irrigation tunnel from Lake Inawashiro. It is remembered as the escape route used by the Byakkotai after the Battle of Tonoguchihara.
Tonoguchi Weir Cave looks like a small spring, but it is part of an old irrigation tunnel from Lake Inawashiro. It is remembered as the escape route used by the Byakkotai after the Battle of Tonoguchihara.