Rimu-miro-tōtara/kāmahi forest is widespread on terraces with moderately drained soils in beech-free parts of Westland, the Catlins, and Rakiura/Stewart Island.

Rimu, miro and tōtara are the most common conifers. Mataī occurs on freely drained soils, and kahikatea on poorly drained soils. Kāmahi is the most common tree species in the sub-canopy, along with southern rātā, and scattered broadleaf, pōkākā, Fuchsia, tarātā and Quintinia.

The expected natural range* of rimu-miro-tōtara/kāmahi forest is 511,424 hectares.

*area this ecosystem could occupy without the presence of people.