The spring water is famously cold and maintains a nearly constant temperature of 13.5 degrees Celsius regardless of the season.
The water discharge rate is measured at 30 tons per minute, making it one of the most prolific springs in the Aso region.
The spring is categorized as one of the 100 Remarkable Waters of Japan, a prestigious environmental designation.
The site is home to mature Japanese Judas trees (Cercidiphyllum japonicum) that are estimated to be several hundred years old.
Local folklore attributes the longevity and vitality of the village residents to the consistent purity of this spring water.
Ikeyama Spring is a natural spring located in the village of Ubuyama, Kumamoto Prefecture, renowned for its consistent water temperature and high quality. The spring produces approximately 30 tons of water per minute, which maintains a year-round temperature of roughly 13.5 degrees Celsius. It is officially recognized as one of the 100 Remarkable Waters of Japan by the Ministry of the Environment. The water flows through a surrounding forest of ancient Japanese Judas trees and giant spruce, which creates a natural canopy. Visitors can observe the water bubbling up through layers of volcanic sand. It serves as a primary water source for the local community and surrounding agriculture. The site is part of the Aso Kuju National Park region.
The wooden footbridge overlooking the main spring pool where the water is clearest and most vibrant.
Bring a clean, reusable water bottle to fill up directly from the spring source.
Wear comfortable, non-slip walking shoes as the surrounding forest paths can be damp and uneven.
Visit during the early morning to enjoy the natural quiet and clear light before crowds arrive.
Do not leave litter in the forest, as the spring is a vital drinking water source for the local community.
Maintain silence to preserve the tranquil environment and do not bathe in or pollute the spring water.
