Island of Tidra in the Bay of Arguin, Mauritania – February 10th, 201119.7N 16.4W
The green waters of the Bay of Arguin (or Banc d’Arguin), a bay on the Atlantic shore of Mauritania, are caused by intense phytoplankton reproduction. The bay contains the 12,000 km² Banc d’Arguin National Park and the islands of Arguin and Tidra.
Tidra is an offshore island 18 miles long and 5 miles wide. It is easily spotted in this image as it is the largest island off the shore of the bay. Arguin, visible in the full image due north of Tidra, is six km long by two km wide. Extensive and dangerous reefs are located in the waters by the island.