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. West Bengal's capital Kolkata is the largest city of this region. The Kolkata Metropolitan Area is the country's third largest. The region is bounded by Bhutan, Nepal and the state of Sikkim in the north, the states of Uttar Pradesh and Chhattisgarh on the west, the state of Andhra Pradesh in the south and the country of Bangladesh in the east. It is also bounded by the Bay of Bengal in the south-east. It is connected to the Seven Sister States of Northeast India by the narrow Siliguri Corridor in the north east of West Bengal.