Blue Lake

Lom Phu Khiao — “Blue Lake” to most visitors — is a near-circular sinkhole pond inside Tham Pha Thai National Park, about 130 km north of Lampang city in Ngao district. The water reads electric blue-green against the surrounding limestone and evergreen forest, a colour driven less by minerals than by sheer depth: nobody has confirmed the bottom. A diver who once tried couldn’t reach it and estimated at least 40 metres.

The lake formed when underground water slowly dissolved the limestone bedrock until the cavern roof gave way, leaving a steep-sided pool ringed by cliff and forest. There’s no trail around the water itself — visitors reach two fixed viewing platforms on the ridge above, connected by the stairway from the car park. That’s the whole visit: no boardwalk circuit, no lakeside path, so budget 45 minutes to an hour rather than a half-day hike.

Because swimming is banned and the platforms sit above the waterline, this is a look-not-touch stop — bring a longer lens if photography is the goal, since the strongest colour contrast reads from height rather than at the water’s edge. The surrounding forest stays shaded even at midday, which helps given the exposed final stretch of the access road.

Insider Tip: Go in the dry season (November–March) after a stretch without rain — heavy rain stirs up sediment and dulls the blue, and the unpaved final 2 km of the access road gets rough when wet.

Watch out: The last section of road to the car park is unsealed and can be hard on a standard rental car’s clearance after rain; a truck or higher-clearance vehicle is safer outside the driest months. There’s no food or drink stall at the site and mobile signal is patchy, so bring water and sort your return route before setting off.

Pair the trip with the wider Tham Pha Thai park, since it’s roughly a two-hour drive each way from Lampang city — most visitors treat it as a long day trip rather than an overnight stay, as camping facilities at the park are limited.