The Naf River is an international river marking the border of southeastern Bangladesh and northwestern Myanmar.

The Bangladesh–Myanmar border is the international border between the countries of Bangladesh and Myanmar. The border stretches 271.0 kilometres, from the tripoint with India in the north, to the Bay of Bengal in the south. About 210 km (130 mi) of the border is fenced, with the government of Myanmar announcing in 2017 that it was planning to fence off the rest of the border.