Oirase Steam

Oirase Stream is a natural monument and waterway that winds for 14 kilometers through dense forests, featuring multiple waterfalls, clear water, and rock formations shaped by the river's flow. The terrain alternates between steep banks, areas of rushing water, and sections of calmer flow where the landscape opens up slightly.

The waterway formed following volcanic activity that created Lake Towada over 200,000 years ago when a caldera collapsed, allowing rainwater to accumulate in the depression. This geological transformation shaped the entire region and established the foundation for the landscape features visible today.

The stream holds significance in Japanese nature conservation as a protected natural site that reflects the country's commitment to preserving exceptional landscapes. Visitors can observe how locals and travelers use the pathway to connect with the flowing water throughout the seasons.

Walking paths and roads run parallel to the stream at water level, providing direct access to viewing points between April and November. The trails are well-marked, though the ground can be slippery, especially after rain or during wetter months.

During winter months, many waterfalls transform into frozen cascades that create natural ice formations throughout the gorge. This seasonal change draws specialized photographers who come to capture the frozen landscape.