The eastern region of India comprises the states of West Bengal, Odisha, Jharkhand, and Bihar; in its easternmost part lie the eight hill states of Arunachal Pradesh, Assam, Mizoram, Nagaland, Manipur, Meghalaya, Tripura, and Sikkim. One of the most important rivers that flow through this region is the mighty Brahmaputra, which originates in Tibet and eventually merges into the Bay of Bengal.
The region was the historical centre of several mighty dynasties whose kings and emperors helped it flourish and prosper right from 13th century (Islamic rulers), Mughal empire (16th and 17th centuries) and thereafter colonial rule (till mid 20th Century). Many battles were fought in what is today State of West Bengal and Tea Plantations of Darjeeling (developed during Raj era) have achieved an Iconic status in Western World for its “Darjeeling Tea”, making East India an integral part of the Colonial history.
Kolkata is steeped in Colonial history and is a popularly visited alongwith Sunderbans Delta, a UNESCO heritage site and renowned bird watching destination. Orissa, to the South of Kolkata is renowned for its Konark Temple (UNESCO heritage), Buddhist heritage (Ratnagiri, Udayagiri), Coastal areas (Puri), Tribal heritage and bird watching destinations (such as Chilika Lake). Bihar to the East of Kolkata is renowned for its Buddhist heritage destinations of Bodhgaya, Rajgir and Vaishali, and form integral part of any Buddhist circuit. Hillside / Plantation areas of Darjeeling / Sikkim is one for the heritage train, Tibetan Buddhism and Himalayas.
Farther to the east of Darjeeling / Sikkim are the offbeat areas of Meghalaya, Assam and Arunachal Pradesh, renowned for its Wildlife, plantation bungalows and remote Himalayas. States of Nagaland, Manipur, Mizoram and Tripura are least visited in Eastern India and one for the well heeled International travellers looking to explore tribal heritage and festivals of the area.