The forest
What grows on Tsugaike Mountain Resort
Mostly deciduous — broadleaf woods and larch. They stand bare through the winter, and you can see a long way into them.
Read off the national vegetation survey. Where the pistes are cut the survey records open ground, so the ski area draws itself.
Where that sits among the mountains we publish
Its forest goes bare more readily than 12 of the 29 mountains we publish.
01
Sight range, level by level
The mountain seen side-on. How far you can see into the trees changes with height, and each band is drawn level with its own row.
| Height | What you can see through | Bare |
|---|---|---|
| 2,140–2,316 m | | 51% |
| 1,964–2,140 m | | 75% |
| 1,788–1,964 m | | 52% |
| 1,613–1,789 m | | 68% |
| 1,437–1,613 m | | 95% |
| 1,262–1,438 m | | 96% |
| 1,086–1,262 m | | 92% |
| 910–1,086 m | | 93% |
| 735–911 m | | 76% |
| 559–735 m | | 68% |
Each reading is a share of that band's own forest, not of the mountain, and a band holding too little forest to state one is left blank. The pale bar behind the section is how much ground sits at that height, so a swing over a sliver of mountain does not read as a headline. No treeline is drawn — the survey describes stands, not a line.
02
What stands beside each run
A band 35 to 90 m either side of each run’s centre line: outside the groomed piste, inside what you look at from it. Ordered by how much of that band is forest you can see through in winter.
| Run | The band either side | See-through |
|---|---|---|
| Uma-no-se Course 1,455 m | 86% | |
| Han-no-ki Green Slope 899 m | 82% | |
| Rindo Course 7,062 m | 80% | |
| Intermediate Terrain Park 976 m | 72% | |
| Han-no-ki Slope 1,702 m | 70% | |
| Advanced Terrain Park 619 m | 66% | |
| Shirakaba Slope 1,238 m | 58% | |
| Karamatsu Slope 1,249 m | 46% |
The other 10 runs
| Run | The band either side | See-through |
|---|---|---|
| Champion Rindo Slope 1,386 m | 45% | |
| Tsuga-no-mori Slope 705 m | 45% | |
| Champion Slope 1,011 m | 36% | |
| Kane-no-naru-oka No.2 Slope 829 m | 22% | |
| Maruyama Slope 765 m | 22% | |
| Oya-no-hara Slope 1,224 m | 10% | |
| Kane-no-naru-oka Slope 3R 945 m | 4% | |
| Kane-no-naru-oka Slope 3L 948 m | 3% | |
| Kane-no-naru-oka Slope 2R 942 m | 0% | |
| Kane-no-naru-oka Slope 2L 932 m | 0% |
Each figure is a share of the surveyed ground in a band 35–90 m either side of that run — not of the run, and not of the mountain. The survey resolves about 18 m on the ground and the band is a few cells wide, so this says what the band is made of, never what one tree, one gap or one line of sight is like. A run the survey barely covers is left out rather than stated from a handful of cells. No treeline and no stem density: the survey records stands, not either of those.
03
What actually grows here
The survey sorts every polygon into one of its own vegetation zones before it gives a stand a name. Five or six zones describe a mountain; the named stands underneath them run to dozens.
| Vegetation zone | Share of classified ground | Share |
|---|---|---|
| Beech-zone regrowth ブナクラス域代償植生 | 35% | |
| Natural beech-zone forest ブナクラス域自然植生 | 30% | |
| Plantation and farmland 植林地・耕作地植生 | 17% | |
| Natural subalpine conifer forest コケモモ－トウヒクラス域自然植生 | 13% | |
| Other その他 | 5% | |
| Riverside, wetland, salt marsh and dune 河辺・湿原・塩沼地・砂丘植生 | 1% | |
| Natural evergreen broadleaf forest ヤブツバキクラス域自然植生 | 0% | |
| Evergreen broadleaf-zone regrowth ヤブツバキクラス域代償植生 | 0% | |
| Alpine natural vegetation 高山帯自然植生域 | 0% |
The named stands underneath
The survey’s own community names, largest first. They are proper names for stand types and the survey publishes no English for them, so they stand in Japanese here rather than as a translation we invented.
- チシマザサ－ブナ群団 26%
- オオバクロモジ－ミズナラ群集 25%
- ススキ群団（V） 9%
- オオシラビソ群集 6%
- スギ・ヒノキ・サワラ植林 6%
- カラマツ植林 5%
The other 36 communities
- 水田雑草群落 3%
- ササ－ダケカンバ群落 3%
- 緑の多い住宅地 3%
- ダケカンバ群集 2%
- チャボガヤ－ケヤキ群集 2%
- ヒメヤシャブシ－タニウツギ群落 1%
- ケヤキ二次林 1%
- アカミノイヌツゲ－クロベ群集 1%
- ササ群落（V） 1%
- 残存・植栽樹群をもった公園、墓地等 1%
- 畑雑草群落 1%
- 自然裸地 0%
- 市街地 0%
- ナナカマド－ミネカエデ群落 0%
- コゴメヤナギ群集 0%
- ヤナギ高木群落（IV） 0%
- ヌマガヤオーダー 0%
- 牧草地 0%
- その他植林 0%
- ツルコケモモ－ミズゴケクラス 0%
- 開放水域 0%
- ブナ二次林 0%
- 放棄水田雑草群落 0%
- タニウツギ－ノリウツギ群落 0%
- ユキグニミツバツツジ－アカマツ群集 0%
- カラマツ群落 0%
- 放棄畑雑草群落 0%
- アカマツ植林 0%
- ジュウモンジシダ－サワグルミ群集 0%
- ニセアカシア群落 0%
- 路傍・空地雑草群落 0%
- コケモモ－ハイマツ群集 0%
- コメツガ群落 0%
- ヤマハンノキ群落 0%
- 伐採跡地群落（V） 0%
- 造成地 0%
Every share is of the ground the survey classified on this mountain — not of the forest, and not of the ski area. The zones are the survey’s own; the English beside each one is our gloss and the Japanese is what the source says. Ordering is by area, and says nothing about what skis well.
04
How natural this vegetation is
The survey places every polygon on a ten-point scale of how little people changed it: 1 is made ground with almost nothing growing on it, 10 is natural grassland and alpine heath. It measures interference and nothing else — natural fir sits at 9 and is a wall you cannot see through, a larch plantation sits at 6 and is evenly spaced and lovely to ski.
| Level | Share of classified ground | Share |
|---|---|---|
| 10 | Natural grassland and alpine heath | 1% |
| 9 | Natural forest | 42% |
| 8 | Regrowth close to natural forest | 0% |
| 7 | Secondary forest | 26% |
| 6 | Plantation | 12% |
| 5 | Tall secondary grassland | 10% |
| 4 | Short secondary grassland | 0% |
| 3 | Orchard, tea and mulberry field | 1% |
| 2 | Farmland and green residential land | 7% |
| 1 | Built-up and made ground | 0% |
1% of the classified ground carries a code that is not one of the ten levels. It is left out of the rows above rather than counted as a level.
Every share is of the ground the survey classified on this mountain. The scale records how little people interfered and nothing else: it is not a ranking, and a higher level is not a better place to ski. Levels this mountain does not carry are absent rather than drawn as zero.
National vegetation survey, 2024 edition — Biodiversity Center, Ministry of the Environment, Japan. Modified data, not produced by the Ministry.
This mountain's polygons were surveyed in 2017: the edition is 2024, the looking is older.
About 18 m per cell — fine enough to describe a hillside, never an individual gap between two trees.