Chigasan

Chigasan is a stratovolcano located on the northern portion of Kyori Island in the fictional nation of Shiran. It rises to about 2,140 meters, making it the island’s highest point. The volcano is part of the Shiran volcanic arc and is mainly built from andesitic rocks. The most recent confirmed eruption occurred in 1998, with subsequent minor fumarolic activity at the summit. The crater is approximately 1.3 kilometers in diameter and hosts a complex of lava domes along the eastern flank. The mountain is monitored by the Shiran Geoscience Agency using seismic networks and satellite data.

Etymology: The name Chigasan derives from the local Shiran language, with elements that are interpreted as earth and fire, reflecting the mountain’s volcanic origin.

Geography and ecology: The mid- and upper slopes are forested with subalpine conifers, shifting to alpine meadows near the summit. The area supports a range of wildlife common to high-elevation habitats, including various birds and small mammals, as well as endemic plant communities adapted to volcanic soils.

Human use and culture: The site lies within Shiran National Park, which protects the volcanic landscape and its ecosystems. A marked North Ridge Trail provides access to the summit, with round trips typically taking 6–8 hours. Weather can be severe, and visitors are advised to check volcanic activity reports. The mountain holds cultural significance for nearby communities, who hold seasonal rites and festivals related to the mountain’s enduring presence.

Conservation: Park regulations restrict camping and waste disposal to minimize environmental impact and preserve habitat integrity around the volcanic feature.