Shiga's third-largest keyhole mound, on a hill above Lake Biwa's southern shore in Zeze, Otsu. Maintained as Chausuyama Park, its mound path overlooks the city and lake. An Akiba shrine stands at the waist, and the park is a beloved cherry-blossom spot.
Finds & research
Stone paving and cylindrical/figural haniwa. Grave goods unknown (burial unexcavated).
Two views on the occupant
Archaeological view
A keyhole mound ~122m long (or ~120m; rear circle ~70m) — third largest in Shiga. Built in the late 4th–early 5th century, with stone paving and cylindrical/figural haniwa confirmed; the burial itself is unexcavated. Commanding the southern gateway of Lake Biwa, its occupant likely controlled lake and Seta River traffic. The round Ko-Chausuyama Kofun to the south shares the designation.
Imperial Household Agency view
Not designated by the IHA. National Historic Site "Chausuyama and Ko-Chausuyama Kofun" (1921). Local traditions link it to Prince Hikoimasu or the family of Prince Otomo (Emperor Kobun), without corroboration.
Field notes
About 5 min on foot from Kawaragahama Station (Keihan). Freely accessible as Chausuyama Park. Combines well with Zeze Castle Park and Gichuji Temple on an Otsu walk.