In a physical map of India if you have to locate the Deccan Plateau, it will…

Physical (relief) maps use a standard hypsometric colour convention to show elevation bands: green marks low-lying plains, yellow marks plateaus and moderate-elevation land, and brown marks high mountain ranges.

The Deccan Plateau is a plateau region, with elevation roughly between 300 m and 900 m — squarely in the moderate-elevation band of this convention. On a physical map of India, that moderate band is shaded yellow, so the Deccan Plateau is depicted in yellow.

This is consistent with how the rest of the same map is shaded:

• The Northern Plains, being low-lying, are shaded green.

• The Himalayas, being the highest range, are shaded brown.

• Orange does not form part of this standard elevation-band scheme on Indian physical maps.

Therefore, the Deccan Plateau on a physical map of India is represented by the colour yellow.