BANDIRMA, Turkey — The Sea of Marmara, fabled for centuries for its blue waters and sparkling fish, laps the shores of Istanbul. Its perfect form inspired a 19th-century historian to describe ...

As summer warms Istanbul’s waters, the megacity’s authorities are having to battle a noxious algal bloom dubbed “sea snot”.On a crisp, bright late April day, when the cold poyraz winds blow down from ...

The Marmara has seen regular mucilage outbreaks since 2007. This is the biggest one yet. Vast sheets of brown and grey slime float on the water, clogging boat engines and washing up on beaches.

The United States Geological Survey reported the earthquake was of magnitude 6.2 at a shallow depth of 10 kilometers, with its epicenter about 40 kilometers (25 miles) southwest of Istanbul in the ...