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