Introduction to the No. 1 Cave in the World: The Karst Cave was formed 180 million years ago. It is 4.2 kilometers long and winding. An underground river runs through it from beginning to end. It is known as the "No. 1 Cave in the World".
Introduction to the No. 1 Cave in the World: The Karst Cave was formed 180 million years ago. It is 4.2 kilometers long and winding. An underground river runs through it from beginning to end. It is known as the "No. 1 Cave in the World".