Tan Rua Waterfall (Secret Falls): Free, 250 m Walk, Maenam

Overview

Tan Rua Waterfall, widely known among locals and repeat visitors as the “Secret Falls,” is a majestic natural attraction hidden deep in the hills of Maenam. While it doesn’t get the same volume of traffic as the Na Muang falls, it is officially recognized as the third-largest waterfall on Koh Samui. It offers a perfect blend of raw jungle adventure and a few unique creature comforts, such as one of the island’s most famous “treehouse” cafés.

Set within a lush, narrow valley, Tan Rua features a dramatic multi-tiered drop that is particularly impressive after the monsoon rains. The surrounding forest is incredibly dense, creating a true “lost world” atmosphere just a short drive from the northern beaches.

Why “Secret Falls”?

For many years, Tan Rua was truly a secret, accessible only via rugged dirt tracks used by local farmers. Even today, despite the improved concrete roads, it remains a “hidden” spot because it requires a deliberate journey deep into Maenam Soi 5.

The “secret” vibe is maintained by the way the waterfall is positioned: it is tucked into a steep ravine, and you cannot see it from the road. You must descend into the jungle to reveal the cascading tiers. This natural fortification keeps the large tour buses away, leaving the site to independent explorers and adventure seekers.

The Hike Experience

Compared to the long treks required for some other falls, the walk to Tan Rua is relatively short but involves a significant change in elevation.

• The Descent: From the parking area near the café, you descend a series of rustic wooden and stone steps.
• The Trail: The path is roughly 250 meters long. While it is short, it is steep. Those with knee issues or limited mobility should take it very slowly.
• The Environment: As you walk down, the temperature drops and the air becomes humid. You’ll pass under giant ferns and past massive boulders that have rolled down from the mountain peaks over centuries.

Tree Bridge Coffee

One of the unique aspects of visiting Tan Rua is the Tree Bridge Coffee café located right at the trailhead. This is not your average coffee shop; it is built 20 meters high into the giant trees of the valley.

• The Bridge: A long, thrilling suspension bridge connects different sections of the café and leads to a panoramic viewpoint.
• The View: From the platforms, you can look out over the entire jungle valley toward the Gulf of Thailand and Koh Phangan.
• A Refreshing Stop: After the humid hike back up from the falls, there is nothing quite like a cold coconut or an iced latte while sitting among the treetops.

Getting There

Tan Rua Waterfall is located in the northern interior, accessed through the Maenam district.

Open the full map

• Maenam Soi 5: The primary access point is Maenam Soi 5, located near the Maenam Post Office on the main Ring Road (Route 4169).
• The Drive: The road is concrete and in good condition, but it is extremely steep in several sections.
• Safety Warning: If you are riding a scooter, ensure you are experienced with mountain driving. On the way back down, use both brakes intermittently to prevent them from overheating and failing.
• Parking: There is a designated parking area at the end of the road, managed by the local family who runs the café and zipline.

When to Visit Tan Rua Waterfall

To see the “Secret Falls” at their most impressive, timing is everything.

Season	Months	Waterfall Status	Recommendation
Post-Monsoon	December - February	Peak Flow	★★★★★ The absolute best time for photography and swimming.
Hot Season	March - June	Low Flow	★★ Can dry up significantly; visit for the treehouse café instead.
Shoulder Season	July - September	Moderate	★★★ Water levels vary; usually enough for a nice atmosphere.
Monsoon	October - November	Dangerous	★★ High water can make the steps very slippery and dangerous.

Rain above, the fall below

Jan 125 Roaring Feb 65 Roaring Mar 115 Trickling Apr 85 Silent May 130 Silent Jun 135 Trickling Jul 115 Rushing Swim Aug 100 Rushing Swim Sep 120 Rushing Swim Now Oct 295 Rushing Swim Nov 445 Roaring Dec 265 Roaring

Island rain, mm, above the line This fall's flow below it: strong, good, low; dotted is dry Swim month

January Most dramatic, admire it from the rocks

• Flow: Roaring
• Too strong
• 125 mm over 8 days
• Island crowds high

February Most dramatic, admire it from the rocks

• Flow: Roaring
• Too strong
• 65 mm over 4 days
• Island crowds high

March A thin line of water, wade in the pools

• Flow: Trickling
• Too low
• 115 mm over 5 days
• Island crowds moderate

April Bare rock: come back after the rain

• Flow: Silent
• Too low
• 85 mm over 6 days
• Island crowds moderate

May Bare rock: come back after the rain

• Flow: Silent
• Too low
• 130 mm over 11 days
• Island crowds low

June A thin line of water, wade in the pools

• Flow: Trickling
• Too low
• 135 mm over 10 days
• Island crowds low

July The swim months: water to swim in

• Flow: Rushing
• Swim OK
• 115 mm over 11 days
• Island crowds moderate

August The swim months: water to swim in

• Flow: Rushing
• Swim OK
• 100 mm over 10 days
• Island crowds moderate

September The swim months: water to swim in

• Flow: Rushing
• Swim OK
• 120 mm over 11 days
• Island crowds low

October The swim months: water to swim in

• Flow: Rushing
• Swim OK
• 295 mm over 16 days
• Island crowds low

November Most dramatic, admire it from the rocks

• Flow: Roaring
• Too strong
• 445 mm over 16 days
• Island crowds low

December Most dramatic, admire it from the rocks

• Flow: Roaring
• Too strong
• 265 mm over 12 days
• Island crowds high

Tan Rua and three other falls

Each card shows a fall's year, with this month marked, so you can see which one fits your day.

• 

  You are here

  Tan Rua

  Rushing

  Walk

  5-10 min

  Gate

  20 THB, parking only

  Kind

  Roadside

  Flow rank

  No. 3 of 11
• 

  Na Muang

  Roaring

  Walk

  5-40 min

  Gate

  60 THB, parking only

  Kind

  Roadside

  Flow rank

  No. 6 of 11
• 

  Khun Si

  Roaring

  Walk

  10-15 min

  Gate

  50 THB, parking only

  Kind

  Steep hike

  Flow rank

  No. 2 of 11
• 

  Hin Lad

  Roaring

  Walk

  20-40 min

  Gate

  Free

  Kind

  Jungle walk

  Flow rank

  No. 4 of 11

The full list and the year of every fall

Adventure & Ziplining

For those who want more than just a quiet walk, Tan Rua is a hub for canopy adventures.

• Zipline Canopy Tour: There is a high-quality zipline course that operates right over the waterfall valley. You can glide through the air, passing directly in front of the cascading water.
• Viewpoints: Several small paths branch off the main trail leading to higher viewpoints that offer a different perspective of the waterfall’s upper tiers.

Practical Tips

• Footwear: Wear shoes with a good grip. The wooden steps and jungle path are often damp and can be very slick.
• Bug Repellent: The valley is a natural basin for moisture and mosquitoes. Apply repellent before you start your descent.
• Combine your trip: Since you are already in the Maenam hills, consider visiting the Chinese Temple in Maenam village on your way back to the Ring Road.
• Time of day: Go in the morning. The steps are cooler and less crowded, and the climb back up is easier before the midday heat.
• Carry light: Bring water, a dry bag for your phone near the pool, and small change for parking and the café.
• Cost: While the waterfall is free, please support the local community by purchasing a drink at the café or tipping the parking attendant.

What a visit looks like, step by step

1. Drive in: Turn onto Maenam Soi 5 near the Maenam Post Office and follow the concrete road uphill to the end. Use low gear and both brakes on the return.
2. Park: Pay the small parking fee (about 20 THB, ~0.60 USD) at the area run by the family behind the café and zipline.
3. Walk down: Take the roughly 250 meter path of wooden and stone steps. Allow 5 to 10 minutes down and a little longer back up.
4. See the falls: The multi-tiered drop falls into a pool at the base. Look for the rust-streaked rock face and the boulders around the pool.
5. Cool off: Swim only if the flow is gentle and after checking the depth, since the bottom is uneven.
6. Recover at the café: The climb back is humid, so a cold drink at Tree Bridge Coffee is the usual finish.

Tan Rua Waterfall or Na Muang?

Tan Rua is the quieter, shorter option in the north: a 250 meter walk from the parking area and a café with a treetop bridge. Na Muang has more traffic. If you want a jungle escape with almost no walking, choose Tan Rua; if you also want to combine it with a longer hike, see the Tan Rua trail.

FAQ

Can I swim at Tan Rua Waterfall? Yes, there is a pool at the base of the main tier. However, the pool is not very large and the bottom can be uneven with submerged rocks and tree branches. Always check the depth before entering.

Is it safe for young children? The walk is short but the steps are steep and can be slippery. Older children will find it an adventure, but it is not recommended for toddlers or anyone requiring a stroller.

When is the best time to visit Tan Rua Waterfall? December to February, when the falls are at peak flow after the monsoon. From March to June the flow can drop sharply, and in October and November high water makes the steps slippery. Go early in the morning for cooler air on the climb back up.

Is there an entrance fee for Tan Rua Waterfall? No, the falls are free. Parking costs roughly 20 THB (~0.60 USD), and the family running the parking area and Tree Bridge Coffee appreciate a drink purchase.

Where is Tan Rua Waterfall? In the Maenam hills on the north coast of Koh Samui, reached by Maenam Soi 5 near the Maenam Post Office on Route 4169. The road is concrete but very steep in places.

Is Tan Rua Waterfall the same as the Secret Falls? Yes. Tan Rua Waterfall is known to locals and repeat visitors as the Secret Falls of Maenam, because it sits in a ravine you cannot see from the road. Some guides also write it Tan Rua Secret Falls or simply Tan Rua.

Is Tan Rua Waterfall worth visiting in the dry season? It is still worth a stop for the jungle walk and Tree Bridge Coffee, but expect a thin flow from March to June. If the cascade is your goal, plan for December to February and check recent photos or ask locally before you drive up.

Do I need a 4x4 to get there? No, the road is concrete all the way to the parking area. A regular car or a 125cc+ scooter can make it, provided the driver is comfortable with steep inclines.

How much time should I spend here? If you just want to see the falls, 45 minutes is enough. If you plan to have a coffee at the Tree Bridge café and do the zipline, allow for 2 to 3 hours.

Is the road dangerous? The road is not dangerous in terms of quality, but its steepness requires caution. If you are a beginner on a scooter, consider hiring a taxi instead.