Namtok Nammin Forest Park

Namtok Nammin Forest Park protects a roughly 20-metre waterfall in Mae Lao subdistrict, Chiang Kham district, in Phayao province — on the upland border area that most visitors know for Phu Chi Fa, about 45km further north across the Chiang Rai line. Entry is free, and the falls run year-round, spreading wide across the rock face rather than dropping in one narrow column.

A marked nature trail runs about 1km round trip from the park office to the waterfall, easy enough to walk without a guide. About 700 metres upstream, two limestone caves — locally reported to hold around 300 people each — add stalactite and stalagmite formations for anyone who wants a change from the waterfall itself; bring a torch, since the park doesn’t light the interior. The forest along the trail is genuine understory jungle rather than a manicured park path: expect birdsong carrying through the canopy and butterflies working the trailside flowers, more than any guaranteed wildlife sightings.

The waterfall pools are swimmable, coldest and clearest in the cool season (November-February) when water is calm rather than in full flood. During and just after the rainy season the falls run harder and more dramatic, but currents in the plunge pool pick up too — check conditions with park staff before swimming if you’re visiting July through October. Camping is allowed with your own gear near the park office.

Insider Tip: Combine the visit with a Chiang Kham-to-Phu Chi Fa drive — the forest park sits close enough to the route that it works as an hour-long stop rather than a dedicated day trip.

Watch out: This is a small forest park (วนอุทยาน), not a full national park — don’t expect a visitor centre, restaurant, or English signage. Bring water, cash for any camping fee, and check road conditions in the wet season, when the unpaved sections into the park can turn slick.

For another Phayao-side stop on the same route, Phu Sang National Park — known for a warm-water waterfall — sits in the neighbouring district and works as a second half-day add-on if you’re touring the Chiang Kham area before heading up to Phu Chi Fa.