The major features of physio graphic units are
(i) The Great Mountain walls of the north:
(a) The Himalayas are new fold mountains.
(b) Their surface of relief is highly irregular.
(c) Some of its regions have very high peaks while the other parts are deep valleys.
(d) Plain area is very limited in this region.
(ii) The Northern plains:
(a) The northern plains are almost flat and they extend over a large area. (b) They are made up of alluvial soils.
(iii) The peninsular plateau:
(a) The plateau regions have a senile topography and are also quite vast in terms of area.
(b) This plateau has not witnessed much geological disturbance.
(iv) The Indian coastal plains and the Islands:
(a) The coastal plains extend in the form of a strip along the Bay of Bengal and the Arabian Sea.
(b) The Islands of India are situated in two groups, one each in the southern part of the Arabian Sea and the Bay of Bengal.