Plateau

A broad, elevated tableland with a genuinely flat or gently rolling top, bounded by steep sides or cliffs dropping to the surrounding lowland — the flatness of the summit is the diagnostic feature, distinguishing it from a mountain range’s jagged peaks. Scale is the other tell: a plateau covers a wide area, not a single isolated formation.

Grassland / Steppe

Open grass across a broad elevated tableland, flat enough at the summit to read as a raised plain rather than a peak.

Continental

Setting: Inland

Candidate: The margins of the Tibetan Plateau grassland — unverified, for your own research and confirmation before use.