Prehistoric Petroglyphs at Pha Phak Wan

A row of humanoid figures, arms linked at the shoulder, stretches across a single sandstone boulder at Pha Phak Wan — rock art estimated at roughly 3,600 years old. The boulder itself is a striking piece of geology on its own: about 12 metres from base to top, with the painted panel sitting on the east-facing wall around 5 metres above the ground. Entry is free, and the site lies within the wider grounds of Phu Pha Lek National Park in Song Dao district.

The figures are painted rather than carved — reddish ochre pigment applied directly to the sandstone, now faded but still legible in the right light. Rather than the animal menageries found at some other Isan rock-art sites, this panel focuses on a single repeated human motif: standing forms, evenly spaced, connected arm to arm, which researchers read as a ceremonial or ritual scene rather than a hunting record. Morning sun angles across the east face and picks out the ochre against the pale sandstone far better than the flat light of midday.

Getting to the boulder means a short walk from the nearest track through dry dipterocarp forest — expect birdsong and cicadas rather than crowds. Phu Pha Lek National Park’s headquarters sits about 18 km from the panel and is the best first stop for current trail conditions, since this corner of Sakon Nakhon sees few visitors and paths aren’t always well marked.

Watch out: There’s no signage at the boulder itself and mobile signal is patchy in Song Dao district. Confirm directions at the park office or with a local guide before heading out, rather than relying on a phone map.

Bring water, a hat, and shoes with grip — the trail crosses loose sandstone in places. For more of the same era of rock art in the province, the 3,000-year-old Petroglyphs at Phu Pha Yon make a natural pairing, and Phu Pha Lek National Park itself is worth the wider detour for its viewpoints and trails.