The dialects of the Bengali language are part of the Eastern Indo-Aryan language group of the Indo-European language family widely spoken in the Bengal region of South Asia. The spoken dialects of Bengali are mutually intelligible with neighbouring dialects. Bengali dialects can be thus classified along at least two dimensions: spoken vs. literary variations, and prestige vs. regional variations. Suniti Kumar Chatterji and Sukumar Sen classified Bengali dialects in five classes by their phonology and pronunciation. They are: