Gua Rangko: a saltwater pool inside a cave

Down a few steps into the dark, a hidden pool of clear salt water glows blue where shafts of light fall through the cave roof.

Area

West Flores

Start from

Labuan Bajo

Distance

about 30 km by road and a short boat ride, or about an hour by boat

Time needed

half a day to 1 day

Best season

All year; best on sunny days around midday

Difficulty

Easy

Transport

Car to Rangko village and a small boat, or a direct boat from Labuan Bajo

Tickets & rules

Entrance and boat fees paid locally

Why go

Gua Rangko is one of those places that photographs hint at but never quite capture. It is a limestone cave on the north coast, east of Labuan Bajo, with a small entrance that you climb down into carefully. Inside, a pool of clear, cool water fills the cave floor, connected to the sea through the rock, so it is salty and rises and falls a little with the tide.

In the middle of the day, when the sun is high, light filters through openings in the cave roof and turns the water a glowing, almost electric blue. Floating in it, surrounded by stalactites and dripping rock, is a strange and calming experience. Many people simply lie still on their backs and look up.

The trip is part of the fun. The cave is reached by a short boat ride from the fishing village of Rangko, which is mostly Bajau and Bugis, with stilt houses and boats pulled up on the sand. On the way back, you can stop on a small white beach nearby for a swim and a picnic.

The story

Local fishermen have known the cave for generations; for a long time they used it as a place to rest and to collect fresh-ish water from cracks in the rock. Only in the last decade or so did visitors start coming in numbers, as photos of the blue pool spread online.

The village of Rangko is a good example of the Bajau and Bugis fishing communities along the Flores coast. Houses are built on stilts at the water’s edge, and boats leave before dawn for fishing grounds that families have used for generations. Some villagers now combine fishing with ferrying visitors to the cave, and the entrance fees support the community.

The cave itself, like Batu Cermin, is old reef limestone lifted out of the sea. Rainwater and seawater have dissolved passages through it, and the pool you swim in sits at the meeting point of the two, which is why it feels cool on top and slightly warmer lower down.

Getting there

By road, drive from Labuan Bajo towards Rangko village, about an hour, and take a short boat from there to the cave. Some agencies also run direct boat trips from the harbour, which take longer but are more scenic.

From the landing, the cave is a few minutes’ walk. Steps and a ladder lead down to the water.

A suggested plan

1. MorningDrive to Rangko village and look around the waterfront.
2. Late morningShort boat ride to the cave entrance.
3. MiddaySwim in the cave pool while the light is strongest.
4. Early afternoonStop at a nearby beach for a swim and lunch.
5. AfternoonReturn by boat and car to Labuan Bajo.

Where to stay

Base yourself in Labuan Bajo. Rangko works well on a day when the sea in the park is rough or when you need a break from long boat trips.

Good to know

• Timing matters: the blue glow is best from about 11am to 1pm on sunny days.
• Wear water shoes; the rocks on the way in are sharp.
• Bring a dry bag and a waterproof phone case.
• Agree the boat price and waiting time clearly at the village.