which of the following biogeographical regions in india has highest land coverage

1. deccan peninsula
2. N.E himalyas
3. western ghats
4. gangetic plains

correct answer is 1.
The Deccan Plateau is a large plateau in India, making up most of the southern part of the country. It rises a hundred metres high in the north, and more than a kilometre high in the south, forming a raised triangle within the familiar downward-pointing triangle of the Indian subcontinent's coastline.