Rainbow Falls earns its name from the prismatic light displays that dance through its misty spray during sunny afternoons. This seven-tiered waterfall cascades down limestone cliffs in Trang’s tropical interior, creating natural pools perfect for swimming at each level. Unlike many of Thailand’s more crowded waterfalls, Namtok Sai Rung remains refreshingly uncrowded, offering visitors a chance to enjoy pristine jungle swimming holes without the usual tourist masses.
The waterfall plunges through seven distinct levels, each forming its own swimming pool with crystal-clear water that stays cool year-round. During peak flow periods, the sound of rushing water echoes through the surrounding forest, accompanied by the calls of hornbills and the rustle of bamboo in the canopy above. The limestone formations create natural water slides between some pools, while deeper sections near the base provide excellent swimming opportunities. Adventurous visitors can climb behind the main cascade for a unique perspective, feeling the cool mist on their skin while tropical butterflies flutter through shafts of filtered sunlight.
Serenity defines the experience at Namtok Sai Rung, where the only sounds are cascading water and forest wildlife. The jungle setting creates a natural cathedral effect, with towering trees forming a green canopy that filters harsh sunlight into gentle, dappled illumination. Swimming in the emerald-colored pools feels like discovering your own private oasis, especially during weekday visits when you might have the entire waterfall to yourself.
Visit during or just after the rainy season (May through November) when water flow is strongest and the rainbow effects most visible. A moderate 20-minute hike through jungle trails leads to the falls from the parking area – wear sturdy shoes as paths can be slippery. Bring swimwear, snacks, and plenty of water, as no facilities exist at the site. The free admission and relatively easy access make this an excellent value for travelers seeking natural beauty without the commercial development found at more famous Thai waterfalls.
