Lagour

The Flaming Mountain of Lagour is a mentioned feature of landscape near Calormen. According to The Tale of Azaroth's Son, the mountain first began to burn during a war between a Tisroc and the son of Azaroth, a Calormen god. It is somewhere west of Tashbaan. Presumably the lava that flowed out of the volcano of Mt Lagour erupted below, from the underworld nation of Bism.