Standing atop a steep landform created by large volcanic eruptions from Mt. Aso, Oka Castle Ruins cover an area measuring 1,000,000 square meters.

The structure looks like a fortress. While the buildings no longer remain, the stone walls are a major attraction.

Enjoy the beauty of stone masonry combining stones of various shapes by the most skilled craftsmen in Japan at that time. With its unique beauty scattered over the area, the landscape evokes the solemnity of the castle tower in the old days.

Take an enjoyable stroll around the ruins surrounded by the seasonal beauty of nature. It takes a minimum of 30 minutes to complete the round trip from the parking area, to Ote-mon Gate, and to the Main Enclosure where the castle tower was built. There’s no better way to relax than touring the ruins while enjoying the landscape. The observation spots offer panoramic views of Mt. Aso and the Kuju Mountain Range. When tired from walking, you can take a rest at a free rest house in the grounds.

〈Admission fee〉

・High school students or older : 300yen (Group of 20 or more : 200yen)

・Elementary and junior high school students : 150yen (Group of 20 or more : 100yen)

※For the entry to Oka Castle, we are asking for the admission fee to maintain the historic sites. Thank you for your understanding and corporation.