Seiei Mountain is one of Minami Aso Gairin Mountain， and is popular among climbers as the Old Kyusyu 100 celebrated mountains. Its elevation is 1060m.

The pavement is built and this mountain is popular among climbers as the mountain relatively easy to climb.

A pasture spreads in the foot of mountain， and the inside of Gairin Mountain has the wonderful view of a natural forest and a rocky ridge. This is famous for a beauty spot of turning colors in fall.

You can enjoy the panoramic view of Nekodake and Takadake from the top of mountain.

There is a big rock with drawn with petroglyph (ancient letters) on the top of mountain.