TEHRAN - Flocks of migratory geese are shown at Sorkhrud wetland in the northern Iranian province of Mazandaran on December 25, 2016.

The south Caspian Sea refuge will remain dominated by its northerly guests until about mid-May 2017 when the migration season comes to an end.

Every Year, the rich landscape drags hundreds of birdwatchers, backpackers, and bird buffs as well.

The mid-winter population of the migratory birds is estimated to exceed over a million in the whole sandy shorelines of the south Caspian Sea that adds up to 700km.

Furthermore, the Caspian Sea provinces of Gilan, Golestan, and Mazandaran, embracing variety of freshwater lakes, wetlands, and lagoons, are large wintering destinations for pelicans, flamingos, ducks, swans, and coots and some other species.

AFM/MG