Kurokawa Onsen Trail, in Kumamoto-prefecture

 

The most popular hot spring resort in Aso region, located on the northern side of  Mount Aso. 

Widely known for its open-air baths, it is one of the best places to enjoy the atmosphere 

of old town in Japan, where more than 20 Inns (Ryokan）and gift shops standing in a row

along the Tanoharu River, a headstream of the Chikugo River.