Mount Aso (阿蘇山, Asosan) is an active volcano in the center of Kyushu. Its ancient caldera ranks among the world's largest, with a diameter of up to 25 kilometers and a circumference of over 100 kilometers. In the center of the caldera stand the mountain's active volcanic peaks, including Mount Nakadake, whose...

When driving from the main island to the island of Shikoku you pass a giant bridge. Under the bridge giant whirlpools are formed.