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Hiking along the crater rim
Mt. Aso is quite far from Tokyo, but it's well worth introducing to anyone visiting Japan.
As one of the largest volcanoes on Earth, its landscape feels almost otherworldly. The hiking route is truly unique, winding through several craters and along the rims. With little to no vegetation at the summit, it gives the surreal impression of walking on Mars 👽.
Unlike Mars, however, Mt. Aso is easily accessible via public transportation. If you're driving, it takes less than an hour from Kumamoto Airport.
A Google Earth image reveals the concentric structure of the greater Aso crater, home to thousands of residents. The outer rim, known as "Gairinzan" or "Outer Ring Mountains," spans more than 10 kilometers in diameter.
The hike itself takes six hours—roughly half a day—but staying a few extra days would make for an even richer experience. You'll have the chance to explore unique sights that can only be found here, such as the Volcano Museum, hot spring hopping, or the breathtaking waterfalls cascading from the lava plateau.
