Seki Onsen Ski Resort Mountain
The landform the resort sits on: the shape of the hill beyond the pistes, how steep it gets, and where it stands among the mountains on JapowDB.
Broadly one hillside, leaning to the east-south-east.
Where this vertical sits among the mountains on JapowDB
310 m, more than 1 of the 40 mountains on JapowDB.
The mountain
神奈山 (Kanna-san)
- Above it
- 妙高山 (Myōkō-san) 2,454 m
- Landform
- Myoko is a double volcano. Its top was blown out into an explosion caldera about 3 km across, and the 2,454 m summit standing there now is a lava dome that grew inside it later. Kanna-san is one of the peaks left on the rim around that hole, across the Ōtagiri river from Mae-yama. The runs are on Kanna-san's southeast flank, on the outside of the old volcano. They cover a 289 m band and stop at about 1,200 m, some 700 m below Kanna-san's own top.
- Rock
- The rock is andesite and basaltic andesite lava with its own pyroclastic rock, the same kind from top to bottom. What changes is its age, and the change falls inside the band you ride. Sampled on the run centerlines, the ground from the 1,200 m top down to about 1,040 m is late Pleistocene, the body of the old volcano. From about 1,020 m to the base at 913 m it is Holocene, younger material that came down later. The Japan Meteorological Agency records two pyroclastic flows reaching the foot of the mountain about 5,300 and 4,200 years ago; one is named for the Ōtagiri river that runs below these slopes.
From published sources, checked by hand · 2026-10-06
That ground is outside the ski area. It is not patrolled.
Measured
01
Which way it faces
Faces east.
Most of the mapped runs fall away toward the east.
02
How steep it gets
That steep ground sits high on the mountain.
Its steepest pitch measures 37.2°.
Its steepest tenth is steeper than 33 of the 40 mountains here that carry pitch data.
21.9° the steepest tenth of runs
03
How varied it is
Its runs range from 7.3° to 25.7°.
Half of them are gentler than 15.7°. Each mark is one run.
That spread is wider than 26 of the 40 mountains here that carry pitch data.
04
What grows on it
Mostly deciduous: broadleaf woods and larch. They stand bare through the winter, so you can see a long way into them.
Read off the national vegetation survey (2024 edition), from fieldwork in 2017.
The forest on this mountain, in detail