Arunachal Pradesh, formerly known as North East Frontier Agency (NEFA), is the land of rising sun of India. It is endowed with rich biological and cultural diversity. It is entirely a hilly state lies on the mighty Himalayan and Patkoi ranges. It is home of 26 major tribes and 110 sub-tribes with wide ranges of culture, rituals, religion and habits. The state comes under Indo-Myanmar biodiversity zone with centre of origin of several crops and is termed as "Paradise of Botanist." This book is intended for those who want to get preliminary information about this beautiful Himalayan state. This is not about political or current knowledge of Arunachal Pradesh, but about Arunachal Pradesh as it was and as it is. We try to give a brief note on geography, history, people, culture, rituals and practices.