Surjapuri language
Surjapuri is an Indo-Aryan language of the Bengali-Assamese branch, spoken in Eastern India, in the Kosi-Seemanchal region, including some eastern parts of Purnia division (Kishanganj, Katihar, Purnia, and Araria districts) of Bihar, parts of Uttar Dinajpur district in West Bengal and Goalpara Division of Assam in India, as well as parts of Thakurgaon district in Bangladesh and Jhapa district in Nepal. It possesses similarities with Kamatapuri, Assamese, Bengali, Maithili, Urdu, and Hindi.