Weekly Photo Challenge: Big (1)

While travelling in Turkey, we came across this natural big hole filled with fresh water. The size is amazingly big when compared to the two men standing near the edge or the flock of white birds flying over the water. Could it have been a crater of an extinct volcano? we don’t know. .  . . . . . . . . . . . ..  . . . . . …….

PS   I have tracked it down. This is the Obruk Han Golu, doline (sinkhole) below the caravansary near Cappodocia  .