Con Coc Islet (Toad Islet) is situated about 12 kilometers from Bai Chay tourist wharf to the Southeast of Halong Bay. It’s about 9 meters high above the sea level. Viewing from a far distance, the islet looks like a big toad which is waiting for the rain at the middle of the sea.

According to a story of Vietnamese people, once upon a time, the God forgot making rain and this resulted in continuing serious drought threatening the live of all species. A brave toad led a group of animals to meet the God and asked him for a rain. That toad was honored as the uncle of God. Thereafter, when the toad grinds its teeth together, it’s rain immediately. The grind of the toad has become a sign of rain and helps Vietnamese farmers forecast the weather in agriculture.