Soufrière's waterfront was once the capital of French Saint Lucia, its natural harbour sheltering corsairs and sugar traders beneath the twin volcanic cones of Gros Piton and Petit Piton. The bay curves west toward the Caribbean, its seabed dropping sharply where geothermal vents heat the shallows and stain the water milky turquoise near the Sulphur Springs — the world's only drive-in volcano, whose caldera edge sits less than two kilometres inland. By the 1780s Soufrière handled more cacao and coffee than any other port in the Windward Islands, its stone warehouses lining a quay built from ballast rock unloaded by merchant brigs. Today the same waterfront serves as the embarkation point for coastal tours that thread the island's western shore, where rainforest spills directly into the sea and reef fish gather in the warm outflow of submerged springs. The Pitons were designated a UNESCO World Heritage management area in 2004, protecting 2,909 hectares of marine shelf, coral reef, and montane forest. Gros Piton rises 798 metres, Petit Piton 743 metres; both are lava domes formed roughly 200,000 to 300,000 years ago during the Pleistocene, their andesite cores exposed by millennia of erosion. The seaward cliffs drop nearly vertical into water that reaches 60 metres depth within a hundred metres of shore. Hawksbill turtles nest on the narrow black-sand pocket beaches between the peaks, and brown boobies roost on the offshore rocks. A Soufrière boat tour typically departs from the central jetty, where wooden fishing boats still moor alongside fiberglass catamarans. Most routes sail south past Anse Chastanet and the resort-backed cove of Anse Mamin, then turn north to circle the Pitons, anchor off Jalousie Beach — a reclaimed strip between the two peaks — and continue to the Sulphur Springs geothermal field. The springs release hydrogen sulphide and steam at temperatures exceeding 70 degrees Celsius; visitors wade into designated mud baths where the runoff cools to 40 degrees. The volcanic activity is monitored by the Seismic Research Centre of the University of the West Indies, which maintains three permanent GPS stations on the flanks of Qualibou, the collapsed caldera that holds the springs. Catamaran operators often include snorkel stops along the reef wall south of the Pitons, where visibility averages 20 to 25 metres and the coral gardens host sergeant majors, parrotfish, and occasional southern stingrays. The return leg passes the Anse La Raye fishing village and the Marigot Bay inlet before reaching Castries, though shorter tours loop back to Soufrière by early afternoon. Coastal tours from the north typically allocate four to five hours for the round trip, while full-day charters add time for waterfall hikes or plantation visits inland.