Phu Pha Man National Park

The park is a block of limestone hills on the Khon Kaen and Loei border, and its best-known event happens every evening at Tham Khang Khao, the bat cave, in the cliff face. A very large colony of bats roosts inside, and around dusk they leave to feed - not in a scatter but as a continuous ribbon that pours from the cave mouth and winds across the sky in a coiling stream some ten kilometres long. Watching from the ground below the cliff is free of any effort: the column passes overhead. Elsewhere the park, about 350 square kilometres, has the Lai Thaeng cave with rock paintings up to two thousand years old, waterfalls led by the 80-metre Tat Yai, and forest; at Tat Yai, footprints found from 2023 date to the Late Triassic, some 220 million years ago, and include the oldest dinosaur tracks yet known in Thailand and in Asia. Timing is the whole thing - arrive well before sunset, since the emergence starts on its own schedule and does not wait.

What you'll find

• The bat emergence - the colony leaving the cliff cave in a continuous ribbon at dusk.
• The column - a stream of bats some ten kilometres long.
• The cliff - the limestone face the cave opens from.
• The other caves - Lai Thaeng's rock paintings, up to two thousand years old.

When to go

Any evening, arriving thirty to sixty minutes before sunset. November to February for the most comfortable conditions. The emergence happens year-round but numbers vary.

What to expect

Timing is unforgiving - arrive late and it is over. Mosquitoes at dusk are serious. Facilities at the viewing area are minimal. The bats are high overhead; binoculars help, cameras struggle in the light.

Nearby

Phu Wiang, Chum Phae and Khon Kaen are east.

Key facts