Water still runs over some of these rocks, causing the sunlight to twinkle splendidly on these naturally occurring works of art, some of which resemble animals drinking by the river and other objects, depending on the imagination of the viewer.   

Master of geography Truong Hoang Phuong explained that stone figures and holes are often seen upstream of a young river like La Nga, which rises from the Braian Mountain on the Di Linh Plateau and flows downstream through the natural reserve Ong Mountain in Binh Thuan Province, Dong Nai Province and other localities.

Phuong says the holes were created by small round stones spinning very fast, creating a whirlpool effect and carving deep into blocks and boulders.  

Called Noi Khong Lo, or potholes in English, the holes are in many shapes and sizes. Some are as big as bathtubs while others resemble water wells and pots.    

Adventurers who want to see this stone artwork on the La Nga River must trek for hours in the Ong Mountain natural reserve before reaching the beautiful rocks. It must be born in mind that these rocks only emerge in the dry season, as water submerges them in the rainy season when water overflows the estuary of the Dong Nai River.