Sonadia Island is a small island of about 9 square kilometres (3.5 square miles), offshore of the Cox’s Bazar coast in Chittagong Division, Bangladesh. Sonadia is located at Kutubjom Union in Maheshkhali Upazila, 15 km north-west of Cox’s Bazar District Headquarters. It is located at latitude 21.28˝-21.33˝ and longitude 91.50˝-91.56˝. Sonadia Maheshkhali is separated from the main island by a canal.
Sonadia is seen as a potential deepwater port lying on the Bay of Bengal that could serve the landlocked parts of India, Myanmar and China.
Rail connections have yet to be built, and the question of gauge has yet to be resolved as the following gauges are in use or possible:
1,676 mm (66 in) – Bangladesh, India 1,000 mm (39 in) – Bangladesh, India, Myanmar, Thailand, etc. 1,435 mm (56 in) – China.