Gwatar Bay (Persian: خلیج گواتر, Urdu: خلیج گواتر) is an inlet of the Arabian Sea, located on the northeast of the Gulf of Oman, and indenting the Makran coast at the southernmost part of the border of Iran and Pakistan.

Adjacent to the mouths of the two rivers, there are extensive mangrove swamps including the Jiwani Coastal Wetland.

The bay contains important fishing grounds which are being threatened by increasing industrial activity and overfishing as well as the development of the nearby ports of Gwadar and Chahbahar.

[2] In 2021, the provincial government of Balochistan, Pakistan, and the local branch of the World Wide Fund for Nature began building an artificial reef in a four square mile area west of Jiwani.

[3] The reef comprises 330 concrete blocks, each weighing 1.5 tons, mostly placed underwater to attract corals and sea creatures.