Chairman of Quang Ngai People’s Committee Nguyen Hoang Giang and the leader of Ly Son special zone inspect the To Vo Gate. (Photo: nhandan.vn)

The stone arch, which is 2.5 meters high and 8 meters long, was formed naturally millions of years ago when lava from the Gieng Tien volcano rapidly cooled upon contact with seawater and solidified into thick basalt layers.

These layers were eroded by the ocean waves and formed cracks over time, gradually turning into a natural stone arch that resembles a wasp’s nest.