Sai Rung Waterfall

Sai Rung Waterfall — also known locally as Namtok Pak Weep — is a narrow, tall cascade in the Pak Weep area of Khuekkhak subdistrict, a short drive inland from the Khao Lak coast. It’s easy to confuse with Khao Lak-Lam Ru National Park’s waterfalls given the shared area, but Sai Rung sits outside the park boundary on separate land, is free to enter, and doesn’t require a park ticket.

The reality here is modest scale rather than a jungle expedition: park at the trailhead (around 20 THB for parking on the private land), and it’s roughly a two-minute walk before the waterfall comes into view — a single narrow, high drop rather than a multi-tiered series of cascades. It’s a pleasant, low-effort stop rather than a destination waterfall, and reviewers consistently describe it as quiet and rarely crowded, likely because it doesn’t carry the name recognition of the park waterfalls nearby.

Watch out: Don’t confuse this with Trang’s Namtok Sai Rung, roughly 300 km south inside Khao Banthat Wildlife Sanctuary — the shared name (sai rung means “rainbow”) causes genuine mix-ups in trip planning, and the two are in different provinces with different access rules.

Flow depends heavily on season. During and shortly after the rainy months (June-November) the cascade runs at its fullest; in the dry season, expect a much thinner flow or, in a dry year, close to nothing. There’s no lifeguard or formal swimming area, so treat any pool at the base with normal caution rather than expecting a developed swimming spot.

If you want a fuller waterfall experience with a proper trail, Khao Lak-Lam Ru National Park and its Namtok Ton Chong Fa are a short drive away and worth the separate park entry fee.