To Vo Arch of Ly Son

On the northwest side of Đảo Lớn, the big island of Lý Sơn, a natural arch of basalt stands beside the sea. No architect planned it. It is called Cổng Tò Vò, the Tò Vò Gate.

According to the Cultural Heritage Department, the arch began with eruptions of the Giếng Tiền volcano, which took place in seawater. Over thousands of years, the waves wore at the rock without pause until the gate took the shape it has today. The name comes from that shape too. The arch looks like the nest of the tò vò, an insect that often builds dome-shaped nests.

On September 9, 2025, the Minister of Culture, Sports and Tourism signed Decision 3235, which officially ranked Cổng Tò Vò as a national scenic site. A proposal from the provincial government of Quảng Ngãi put the age of the landscape at about 3,000 to 4,000 years. So when Vietnamese settlers began clearing land and founding villages on Lý Sơn in the 17th century, this stone gate had already stood here for thousands of years.

The Quảng Ngãi Department of Culture, Sports and Tourism explains how it formed in more detail. Lava from the Giếng Tiền volcano built up a thick layer of basalt. Over time the waves struck again and again at rock that was joined unevenly. The weaker layer broke and wore away first, leaving a hollow in the middle. The parts above and below were firmer and stayed in place. The result is the arch that stands there now.

Up close, the surface of the stone is dark gray, porous in some places and solid in others. A handbook of Lý Sơn, published on the island's web portal, describes the rocky area as more than 40 meters long and about 3.5 meters high. The widest point is about 8 meters across, and the narrowest about 1.5 meters. The shape is uneven, which shows how differently the waves worked on each part of the rock over thousands of years.

The sea around Cổng Tò Vò is not only beautiful to look at. The Quảng Ngãi department says this area supports seagrass, coral reefs and seafood resources. It is part of a coastal ecosystem around the island that is still fairly healthy. On a day when the water is clear and the sun shines straight down, a person standing at the water's edge can see the colors of the coral beds below.

The Cultural Heritage Department places the gate within the wider cultural world of Lý Sơn. There the Sa Huỳnh, the people of Champa and the Vietnamese lived in different periods. Champa was an ancient kingdom on the central and southern coast of what is now Vietnam. The stone gate has seen all of them. Before the Sa Huỳnh people sowed seed on the island, before the Cham came to the island, before Vietnamese boats first reached the shore, the arch already stood here, listening to the waves. It stands here still.