Hiraodai Plateau
is a small midair karst plateau floats 400 to 700 meters above sea level. It is a designated natural monument, but lime mines have vested rights.

Hiraodai Countryside Park
There are two lime mines on Hiraodai. Mitsubishi Materials' and Sumitomo Ôsaka Cement's. Old site was redeveloped as the park in 2003.

HCP Campsite
is open only summer season. This charged site has walk-in and drive-in campsites, lounge with vending machines, shower room, etc.

Sihôdai Hill
is the other side of Hiraodai. It was formed when an awesome pyroclastic flow of Aso, the world largest volcano, hit 80,000 years ago.

Nakatôge Pass
is the 490 meter-high pass between Suôdai Hill and Sihôdai Hill, Hiraodai Branch Path (1-Lane).

Mt. Ôhera
is 587 meter-high, but looks a small hill when viewed on Hiraodai. Round limestones cover the south slope, so the slope called Sheep's field.

Mt. Yuhudake
viewed from Syôke-no-hana, or the top of Hatimenzan, 650 meters above sea level, Nakatu, Ôita. Hatimenzan is a lave table plateau.

City of Usa
viewed from First Observatory of Mt. Hatimenzan. The top of the mountain is flat and large, so that four observatories and the summit there.