The spring water is sourced from the volcanic subterranean runoff of the Kuju mountain range.
The temperature of the spring remains stable regardless of the season, a characteristic of deep-aquifer groundwater.
The water is classified as high-quality potable spring water, regularly tested by local municipal environmental health standards.
The spring forms a small pond that serves as a habitat for specific varieties of freshwater algae and small aquatic organisms.
The surrounding Oita region is famous for its high density of natural springs and geothermal water sources.
Oike Spring is a natural spring located in the Shonaicho Asono district of Yufu, Oita, noted for its exceptionally clear, cool, and abundant water supply originating from the volcanic aquifers of the Aso-Kuju National Park region. The site features a well-maintained pond fed by subterranean flows that maintain a consistent temperature throughout the year. Visitors can access the water directly, which is frequently used by locals for drinking and domestic purposes due to its high purity. The area is surrounded by rural landscapes and farmland, typical of the Oita Prefecture countryside. It serves as an important ecological site for local aquatic life and is a popular stop for those touring the geothermal areas surrounding Mount Yufu.
The wooden walkway edge looking down into the crystalline water of the pond.
Bring a clean, empty water bottle to collect the fresh spring water directly from the source.
Wear comfortable, non-slip footwear as the ground near the spring edge can be slippery and damp.
Combine your visit with a trip to the nearby Yufuin hot spring resorts for a full day of water-based activities.
Do not swim or wade in the spring, as it is a protected water source used by the local community.
Respect local water collection customs; prioritize locals who may be filling containers for daily use.
