Mt. Aso Nakadake Crater
"Of the group of volcanoes located within the caldera, Nakadake is the one positioned roughly at the center. A ceaseless flow of visitors from around the world come to this volcano, an international rarity where the active volcanic mouth can be observed up close. Nakadake is a volcanic mouth complex with an approximate north-south alignment and it extends around 400 meters east-to-west and about 900 meters north-to-south. There are seven mouths, and thanks to ancient documents and records and observations from the most recent hundred years, we understand that the active site has shifted southwards from one mouth in this complex to the next. The crater lake in the first volcanic mouth, which astonishes visiting sightseers, is a volcanic lake of the kind that arises in volcanic craters during comparatively calm periods of volcanic activity due to the accumulation of extremely acidic water, typically at temperatures between around 50° and 60°C.
The Nakadake crater, filled with its mysterious emerald green water, is a major centerpiece of the Aso UNESCO Global Geopark. Each year, upwards of around one million sightseers visit this location.
Popular spots here include the “Stage of the Tengu,” which stands at the summit of Mt. Aso, and the Moon Viewing Hut just beneath the summit."
AddressKurokawa, Aso, Kumamoto Prefecture