Namtok Kaeng Sopha

Thai tourism directories nickname Namtok Kaeng Sopha “Niagara of Thailand” for the volume of water crashing over its limestone tiers, not a literal size comparison, but a fair sense of how loud this gets in the rainy season. It drops down a three-tiered limestone stairway inside Thung Salaeng Luang National Park, about 2km off the main Phitsanulok-Lom Sak road. Fed by the Huai Khek Yai stream, the falls run roughly 40 metres from top to bottom and are officially the largest waterfall in Phitsanulok province. Thailand even put it on a postage stamp in a 2007 waterfall series.

The three tiers, and the fee

Because it’s inside a national park, the entrance fee follows the Department of National Parks’ standard schedule rather than a site-specific price: as of September 2026, 200 THB for foreign adults, 100 THB for foreign children, 40 THB for Thai adults, and 20 THB for Thai children, plus 30 THB for a car or 20 THB for a motorbike. That single ticket covers the whole park, not just the waterfall, so it’s worth checking whether other Thung Salaeng Luang trails or viewpoints are on your route the same day. The three tiers step down over smooth, pale limestone, each landing a shallow pool wide enough to sit in. The lowest tier is the easiest to reach and the busiest with families; climbing to the upper tiers means picking a path over wet rock, so grip matters more than distance.

When to visit

Water flow swings hard with the seasons. During the rainy months (July-October) the stream runs fast and full, throwing spray and noise that carries well beyond the pools. In the cooler dry season the flow drops to a trickle over some of the ledges, but the pools themselves stay deep enough to swim, and the exposed limestone terraces make natural seating in the sun. Either way, the setting is genuinely quiet outside Thai holiday weekends: this isn’t a waterfall geared toward tour buses.

Watch out: The limestone is slick when wet, especially on the upper tiers. Water shoes make a real difference; flip-flops don’t grip on the rock lips between pools.

Planning your visit

Insider Tip: Weekday mornings are close to empty. If you’re driving up from Phitsanulok city, combine the stop with Thung Salaeng Luang National Park’s other trails rather than treating Kaeng Sopha as a standalone visit: the single park ticket already covers both.

Don’t confuse it with Kaeng Song

Don’t confuse this with Namtok Kaeng Song, a separate and smaller waterfall elsewhere in the same national park: the similar names trip up a lot of first-time visitors mapping their route. Bring cash for the park gate, water shoes for the rocks, and snacks, since food stalls near Kaeng Sopha itself are limited.