The Fire Pits were located in Ta-Metru, and consisted of a series of large square holes in the ground filled with lava. Vats of searing Protodermis were transported over the pits on cables. the Morbuzahk once made an attempt to level out the fire pits. Special permission from Turaga Dume was required for any being to access these pits. Large fences surrounded the pits. Toa Vakama had trouble getting the Ta-Metru disk, as it was in one of these such pits. But, with the help of Toa Onewa, Nuhrii and Ahkmou, he retrieved it. It was damaged by the Great Cataclysm and repaired by the Staff of Artakha.
It was later abandoned after Spherus Magna was reformed.