Wispy clouds cast a mist over one of Mau Son peaks at more than one kilometer above sea level in Lang Son Province, which borders China and 180 kilometers to the northeast of Hanoi. Each season, including the cloud hunting season from August to March, casts Mau Son in a unique light. Adding to the scenic diversity are its inhabitants, including the Dao, Tay and Nung ethnic communities.

The Mau Son mountain range stretches from Mau Son Commune in Loc Binh District to Cong Son Commune in Cao Loc District. A part of the mountain is on the China border, marked by the Chi Ma border gate at the bottom.

Visitors to Mau Son during April and May every year will have the chance to see locals plant rice on terraced fields next to anise forests. Besides rice, locals use the fields to plant corn in early summer, presenting a completely different look.

There are over 10 large streams that flow across the northern and southern slopes, creating many waterfalls with clear water all year round. Travelers can enjoy themselves outdoor camping, swimming by waterfalls and enjoying the sight of hydrangeas, a flower species that blooms profusely every summer.

Mau Son on a winter day in January 2016. This is a rare occurrence, but the snowfall showcases the wide range of weather events that the range hosts.

A village corner on Mau Son during the winter, December 31, 2018.

A woman from the Dao ethnic minority in her traditional, homemade finery smiles beside a peach tree with its pink blossoms. The Dao account for 95 percent of Mau Son's population.

White plum flowers frame the way to a house in a Mau Son village. Thuan, the local photographer, said: "Nature has bestowed Mau Son with fresh air and magnificent mountain landscapes, so you can see the vivid scenic changes that the four seasons display every year."