Overview
I could not verify Tennyo-ga-Hara as a named location in the base game of Ghost of Yōtei. The available official and specialist material identifies the game’s setting as the lands surrounding Mount Yōtei in Ezo, but does not establish Tennyo-ga-Hara as a map region, subarea, mission location, settlement, landmark or collectible site. The official PlayStation material describes Ezo broadly and names several relevant regions and factions, including Yōtei Grasslands, Teshio Ridge and Ishikari Plain, but does not mention Tennyo-ga-Hara.
The exact term Tennyo-ga-Hara does appear in real-world material relating to the Asahidake area of Hokkaidō. There it refers to a mountain wetland or trail area associated with the Asahidake Ropeway and Daisetsuzan National Park, not to a confirmed location in Ghost of Yōtei.
Because the requested guide requires verified boundaries, child areas, named directories, routes, characters, activities and rewards, it would be misleading to construct a full article from the name alone. The evidence currently supports a location-identification note rather than a conventional wiki guide.
Sources
- Ghost of Yōtei is coming in 2025 – PlayStation.Blog — blog.playstation.com
- Tani Kikyo's Discovery of New Plant Species 15: Plants of Daisetsuzan (4)|谷桔梗 — note.com
- Characters and combat - Ghost of Yōtei | PlayStation (US) — playstation.com
- Field manners | Asahidake Visitor Center — asahidake-vc-2291.jp
- Ghost of Yōtei: How Sucker Punch chose Hokkaido for the game’s setting – PlayStation.Blog — blog.playstation.com
- (For Southeast Asia) Jin Sakai returns in Ghost of Yōtei: Most Wanted – PlayStation.Blog — blog.playstation.com