1.It is a highland compressed of old alluvium
2. It is always about the level of the flood plains.
3. It is often impregnated with calcareous concretions known as kankar.
4. It is not much suited for cultivation.
1. It is lowland composed of old alluvium
2. It is flooded almost every year and new alluvium is deposited.
3. It is often characterised by clay soil which is very fertile.
4. Intensive agriculture is practised here.