In Martinique, Mount Pelée is the most active volcano in the Antilles. In 1932, an eruption razed the town of Saint-Pierre and took the lives of almost 30,000 people. Today, the volcano is one of the most studied, but it is also an attraction for hikers. The richness of the rocky substrate of volcanic origin is exploited commercially and the valley has once again become an important tourist spot on the island.

In French Polynesia, extinct volcanoes form the island. The Fautaua Valley plays an important role in the supply of fresh water to the Tahitian capital. By following scientists and guides in the field, we discover the richness of these steep territories.