Piton Argamasse, Volcanic summit in Piton de la Fournaise massif, Réunion Island, France.

Piton Argamasse is a former volcanic cone in the commune of Le Tampon, Réunion, reaching 2,095 metres within Réunion National Park. Its broad, rounded summit holds one of the island's few crater lakes, about 0.8 hectares in area. Seen from the surrounding marshland, the grey-brown peak rises behind flat grassland and shallow water, with a band of cloud often clinging to its right slope.

The peak formed millions of years ago through repeated eruptions of the Piton de la Fournaise volcano. These volcanic processes gradually shaped the island's landscape and continue to create new geological features today.

Piton Argamasse lies within the commune of Le Tampon, in the heart of Réunion National Park, the island's protected upland area. Its crater holds one of the few crater lakes on Réunion, covering about 0.8 hectares. Walkers who reach the rim can look down onto this small sheet of water set in the old volcanic cone.

The main trailhead starts from the parking area near Bourg Murat, where marked paths begin. The hike is challenging and requires sturdy boots and care on the rocky sections.

The crater lake covers about 0.8 hectares, one of the few crater lakes on Réunion. The summit itself reaches 2,095 metres within the commune of Le Tampon, inside Réunion National Park. From the marshland below, the peak shows a broad, rounded profile of grey-brown rock, with a band of cloud often clinging to its right slope.