East India East India East India is a region of India consisting of the Indian states of Bihar, Jharkhand, West Bengal, Odisha and also the union territory Andaman and Nicobar Islands. West Bengal's capital Kolkata is the largest city of this region. The Kolkata Metropolitan Area is the country's third largest. The states of Bihar and West Bengal lie on the Indo-Gangetic plain. Jharkhand is situated on the Chota Nagpur Plateau. Odisha lies on the Eastern Ghats and the Deccan Plateau. The region is bounded by the Nepal and Sikkim Himalayas in the north, the states of Uttar Pradesh and Chhattisgarh on
Geography of West Bengal delta is the largest mangrove forest in the world. It lies at the mouth of the Ganges and is spread across areas of Bangladesh and West Bengal, India. The Bangladeshi and Indian portions of the jungle are listed in the UNESCO world heritage list separately as the Sundarbans and Sundarbans National Park respectively, though they are parts of the same forest. The Sundarbans are intersected by a complex network of tidal waterways, mudflats and small islands of salt-tolerant mangrove forests, and presents an excellent example of ongoing ecological processes. The area is known for its wide range of fauna. The