The largest physiographic division of India is the Peninsular Plateau. This plateau is a triangular landmass that covers almost half of the country. It is bounded by the Aravalli Range to the northwest, the Satpura Range to the north, the Western Ghats to the west, and the Eastern Ghats to the east. Let's examine some of the key features of this plateau.

Geology:
The Peninsular Plateau is made up of ancient rocks, some of which are over a billion years old. These rocks are primarily granites, gneisses, and schists. The plateau was formed by the drifting of the Indian tectonic plate towards the Eurasian plate, which led to the upliftment of the landmass.

Relief:
The Peninsular Plateau is a highly dissected plateau with a number of hills, valleys, and ridges. Some of the prominent hill ranges of the plateau include the Satpura, Vindhya, and Western Ghats. The plateau is also marked by a number of plateaus, such as the Deccan Plateau and the Chota Nagpur Plateau.

Drainage:
The Peninsular Plateau is drained by a number of rivers, including the Godavari, Krishna, Cauvery, and Mahanadi. These rivers flow in a generally eastward direction towards the Bay of Bengal. The plateau is also home to a number of waterfalls, including the Jog Falls and the Dudhsagar Falls.

Climate:
The climate of the Peninsular Plateau is largely influenced by its relief and proximity to the sea. The western and eastern coasts of the plateau receive heavy rainfall due to the Western Ghats and Eastern Ghats respectively. The interior regions of the plateau, however, receive less rainfall and experience a semi-arid to arid climate.

In conclusion, the Peninsular Plateau is the largest physiographic division of India. It is an ancient landmass that is highly dissected and marked by a number of hills, valleys, and plateaus. The plateau is drained by a number of rivers and is home to a diverse range of flora and fauna.