Romania
Black Sea
Bulgaria
Istanbul
Turkey
Greece
Sea of Marmara
Prolonged warm temperatures, an abundance of nutrients and calm weather have led to the formation of a mucus-like substance on the surface of the sea
200km
200 miles
Romania
Serbia
Black Sea
Bulgaria
Istanbul
Turkey
Italy
Sea of Marmara
Ionian
Sea
Aegean
Sea
Prolonged warm temperatures, an abundance of nutrients and calm weather have led to the formation of a mucus-like substance on the surface of the sea
Greece
200km
200 miles