Central Bengali dialects
Central Bengali or Rāṛhī/Rāḍhī Bengali (Bengali: রাঢ়ী বাংলা, romanized: Rāṛhī Bāṅlā, pronounced [ɾaɽhiː baŋla]) is a group of dialects of the Bengali language, spoken in the West-Central part of Bengal, in and around the Bhagirathi River basin of Nadia district and other districts of the Presidency division in West Bengal, as well as the undivided Kushtia district region of western Bangladesh. Associated with the upper Delta and eastern Rarh region of Bengal, it forms the basis of the standard variety of Bengali.