Águas Belas / Great Cave

Águas Belas is a place photographs simply fail to prepare you for. This five to six hour ocean adventure begins as a boat trip out of Tarrafal bay and ends inside a volcanic sea cave that feels like the interior of the earth has opened up to let the Atlantic light in. The Great Cave at Águas Belas is one of the most extraordinary natural features on Santiago Island: a cathedral of basalt with pools of turquoise water fed directly by the sea, clear enough to see the bottom in water several metres deep.

The journey by boat along the coastline of Cape Verde's largest island is an experience in itself. The cliffs that rise from the waterline here are dramatic and largely inaccessible by land, streaked with mineral colours and alive with seabirds. Your guide will navigate around the headlands and into coves that most visitors to Cabo Verde never reach, pointing out the geological features that make this stretch of coast so unusual.

Entry to the cave is by boat at the right tidal moment, through a narrow passage that opens into the main chamber where the water shifts between jade and sapphire depending on the angle of the sun. Snorkelling equipment is included, and the calm volcanic pools offer some of the most sheltered and visually striking snorkelling in Cape Verde, with a mix of reef fish, occasional sea turtles, and sea life adapted to these sheltered basalt formations.

Time is allowed for swimming, snorkelling, and simply sitting in the cave watching the light move across the water. It is difficult to explain but easy to remember. The tour costs €80 per person and runs at an easy pace with no specific fitness requirements beyond basic comfort in the water. Group sizes are kept small to preserve the atmosphere of the place. Book through WhatsApp to confirm your spot and get details on departure times from Tarrafal.