The Coastal Plain region (Karavalli), which lies along the Arabian Sea and has a tropical climate.

The Western Ghats (Malenadu), which are a mountain range that separates the coastal plain from the plateau and has a rich biodiversity.

The Karnataka Plateau (Bayalu Seeme), which covers most of the state and has a semi-arid climate.

The black-soil tract (Kalyana Karnataka), which is a part of the Deccan Plateau and has a dry climate.