Turkey is the world's biggest hazelnut producer with a share of around 70 percent of a nearly $3 billion global industry. 

But this year farmers in one of its biggest growing regions have been hit by both a natural disaster and a currency crisis. 

"We've never seen such a thing in our lives. It was a natural disaster. I was here on the bridge when the flood happened," says Senel Kocakoc, a hazelnut farmer.

TRT World's Arabella Munro went to to the shores of the Black Sea to find out more.