A Niraya. Beings born there suffer from excessive heat (SNA.i.59; J.iii.22; v. 269). The Niraya extends under the whole of the earth and is four nahutas and one hundred thousand yojanas in depth. It is like a cauldron filled up to the brim with molten metal (SNA.ii.480).
It is said (Mhv.iv.38) that when Kālāsoka attempted to extend his patronage to the Vajjiputtaka monks, the devas frightened him with a dream that be had been cast into Lohakumbhī. See also the Lohakumbhi Jātaka.