The coldest place in Jahannam, according to some Islamic sources, is called Zamhareer.
Zamhareer (Arabic: الزمهرير, translit. al-zamharīr) is described as a region at the bottom of hell characterized by extreme, unbearable cold. Instead of the fiery torment typically associated with Jahannam, Zamhareer is a place of intense blizzards, ice, and snow, where the punishment is freezing cold. The extreme coldness itself is a form of agonizing torment for those confined there.
While Jahannam is primarily associated with fire and heat as forms of punishment, the existence of Zamhareer highlights the multifaceted nature of divine retribution according to some Islamic beliefs. The contrasting nature of intense heat and extreme cold underscores the severity and variety of torments within the afterlife.