Sao Din Na Noi

Sao Din Na Noi is a stretch of eroded clay and sediment pillars in Chiang Khong subdistrict, Na Noi district, on the western edge of Si Nan National Park — about 60km from Nan town. Because Nan has several similarly named badlands sites, it’s worth being specific: this is Sao Din Na Noi itself, not the nearby Khok Suea formation or the separate Sao Din Hom Chom/Analai site elsewhere in the province. The formations here sit inside the national park boundary, so the park’s standard entrance fee applies rather than free entry.

The clay towers are estimated at 10,000 to 30,000 years old, dating to when this ground was a lakebed or seafloor. Wind and water have since carved narrow corridors between walls that run several metres high in places, with a reddish tint from iron in the soil. Walking the paths between them means dry, crunching ground in the hot and cool seasons, but the clay turns slick fast once rain hits it.

Watch out: skip a visit during or right after heavy rain — the walking surfaces are unmanaged dirt, not paved paths, and wet clay is genuinely slippery underfoot.

Insider Tip: Early morning light angles into the corridors and picks out the red-orange banding in the clay better than midday sun, when the formations flatten out visually.

Facilities are minimal — this is a natural site inside a national park, not a developed attraction with a visitor centre on-site. Bring your own water and sun protection, and expect dusty conditions in dry months. Sturdy closed shoes matter more here than at most Thai outdoor attractions, since the eroded ground is uneven and the clay can shift underfoot.

For the wider area and where to base yourself, see Nan; the park’s forested core, Si Nan National Park, covers the rest of the protected area beyond the badlands themselves.