Pla Cave

Hook

Pla Cave — properly Wat Tham Pla, the Fish Cave Temple — is a limestone cave shrine on the Mae Sai to Chiang Rai road where a spring-fed stream is home to hundreds of freshwater fish that locals consider sacred. A Buddha image sits just inside the cave mouth, and a troop of wild macaques lives on the hillside above, which is why most Thais just call the whole place the Monkey Temple. Entry is free and it’s open roughly 06:00 to 19:00 daily.

Experience

The cave itself is short: a natural opening in the limestone where a stream emerges, wide enough to walk into without stooping, leading to a Burmese-style Buddha statue built by a Burmese monk who settled here decades ago. Around the entrance, the pools are thick with fish — some over half a metre long — that surface the moment anyone drops in food. Stalls at the car park sell bags of fish pellets for a few baht, and it’s the main activity for most visitors: watching the water churn as dozens of fish compete for scraps.

Above the cave, a set of stairs climbs the hillside past a naga balustrade to a viewpoint over the surrounding hills toward the Myanmar border — this is Golden Triangle country, and on a clear day you can see a long way into the jungle on both sides. The macaques that live on this slope are used to tourists and will approach for food; they’re the reason the site doubles as a “monkey temple” in local shorthand, distinct from the fish in the cave below.

Atmosphere & Timing

It’s a working shrine as much as a sightseeing stop — locals come to make merit at the Buddha image, and the fish feeding has a slightly carnival feel with vendors and day-trippers. Mornings are quieter and cooler for the stair climb; by midday the car park fills with tour vans doing a quick stop between Chiang Rai and the Mae Sai border crossing. The cave interior stays noticeably cooler than the fish pools outside, which sit in full sun through the middle of the day.

Insider Tip: Buy fish food from the smaller stalls further from the entrance — they charge less than the ones right by the car park for the same bags.

Watch out: The macaques on the hillside steal food, sunglasses, and anything dangling from a bag. Keep food out of sight until you’re ready to feed them, and don’t make eye contact or reach toward a monkey holding something.

Practical

There’s no ticket booth — donation boxes sit near the main shrine instead. Wear shoes you don’t mind getting wet near the pools, and bring small notes for fish food and parking. It’s an easy add-on if you’re driving between Chiang Rai and Mae Sai, or heading up to Doi Mae Salong for the tea plantations; combine it with Sao Hin Phaya Nak Cave or the Tham Luang Khun Nam Nang Non cave complex, both a short drive away in the same district.