Second-largest necropolis of the Canaries[1] after that of Arteara, the site is listed Spanish Heritage as a Property of cultural interest in the category "archaeological zone".[9] The tumuli sit on volcanic ground, more precisely on an old lava flow[9] that came out of the nearby volcanoes Jabelobo, Berrazales and Fagajesto.[10] The eruption brought forth an 11 km-wide[4] flow of lava that followed the valley and reached the sea at Puerto de las Nieves.[7][11] The most common ones are a simple ring of volcanic stones, the more sophisticated ones are topped with turret-type stonework and were probably used to bury nobility.Historians think that these people were either Canarians deemed unworthy of burial in the proper ground, or foreigners having landed on the island before the Spanish conquest.[11] These traces consist of white stains of marine deposits left behind by the tsunami waves beating on the steep sides of the valley.