What are the four main physical regions of Karnataka?

Physiographically, the state of Karnataka is divided into four distinct regions:1

• The Coastal Plain: A northward continuation of the Malabar Coast, this region features sand dunes, lagoons, and small alluvial plains.1
• The Hill Ranges: Comprised of the Western Ghats, this upland terrain is known as Malnad and serves as a vital watershed for numerous rivers.1
• The Karnataka Plateau: Located to the east of the Western Ghats, this region consists of undulating, eastward-sloping plains known as the Maidan, with an average elevation of about 1,500 feet (450 metres).1
• The Black-Soil Tract: Situated in the northwest, this region is defined by its fertile, humus-rich soil derived from underlying volcanic rock.1