North Central Bengali dialects
North Central Bengali or Varendrī Bengali (Bengali: বরেন্দ্রী বাংলা, romanized: Bôrendrī Bāṅlā, pronounced [bɔɾendriː baŋla]) is a cluster of Bengali dialects and their varieties, it is also known as Uttaravaṅgīẏa or Udīcya, it is spoken in the Varendra region (primarily consisting of the Rajshahi Division, parts of the Gaibandha and Dinajpur districts in Bangladesh and the Malda division in India excluding Islampur). Varendri dialect was classified by many renowned Indian linguists like Suniti Kumar Chatterji, Sukumar Sen and others.
Source: Wikipedia — North Central Bengali dialects (CC BY-SA 4.0)