|(The world's largest cave in Vietnam Photo of Son Dung)|
This year, seven-month tour instead of the three-month period (February-August) has been. The heavy rains in September. This cave is situated at an altitude of 150 meters above sea level is 200 meters wide. In 2009, the British Cave Research Association members had discovered it. They came in Quang Binh province, the local people had told him about the cave. After that it became known cave in the world.