Quang Tri, Oct. 23 -- A sinkhole about 120 metres deep, with a primeval forest at its bottom, has been explored in Phong Nha-Ke Bang National Park in the central province of Quang Tri.

The findings were announced following an expedition involving experts from the US National Speleological Society (NSS), adventure tourism operator Jungle Boss and the park's management board to survey the sinkhole in the Cha Noi-Khe Gat area.

The sinkhole has an oval-shaped opening measuring about 190 metres wide and 140 metres long. It widens towards the bottom, reaching about 250 metres in length and 200 metres in width, with a depth of around 120 metres.

According to Le Luu Dung, director of Jungle Boss, the sinkhole was first identified through satel...