In high altitude areas, you'll see the pink blooms of Miyama Kirishima flowers and in medium altitude areas there are forests of beech and fir. Due to the Kuroshio Current, one of the largest warm ocean currents in the world, there is a vividly colorful underwater seascape of stony corals and soft corals (seaweed) where a distinctive ecosystem with subtropical fish, such as butterfly fish and heavenly damselfish thrive.

The Kirishima area is home to a variety of birds, including the extremely rare pitta and the ruddy kingfisher. In the nationally designated Miike Wild Birds' Forest you may spot the screech owl, black paradise flycatcher, fairy pitta and forest wagtail.