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.

Trivia
It is not known if the mountain was real or ledgendary.