Mount Azumaya

Mount Azumaya is a volcanic summit that forms a natural border between Nagano and Gunma Prefectures in central Japan. The volcano rises steeply and is composed of andesite rock, part of a larger system of connected peaks.

The mountain formed between roughly one million and 300,000 years ago through successive lava flows and a major eruption that shaped a large collapsed structure. Since then, this location has been defined by its volcanic past and the landscape it created.

The mountain carries different names across neighboring communities, reflecting how local people have historically connected with this location. These variations in naming show the regional character of the area.

Multiple trails lead up to the summit, with a cable car available during summer months for easier access from lower elevations. Weather conditions can change quickly at this altitude, so proper preparation is advisable.

The volcano system consists of several peaks arranged in a ring formation around a large collapsed basin. This circular arrangement gives visitors different perspectives as they explore the mountain and understand its geological structure.

Location: Ueda

Location: Suzaka

Location: Tsumagoi

Elevation above the sea: 2,354 m

Made from material: andesite

Part of: 100 Famous Japanese Mountains, 100 Famous Gunma Mountains

GPS coordinates: 36.54166,138.41280

Latest update: December 7, 2025 10:05