Sunrise Mountains

The Sunrise Mountains was the name of a mountain range in Thay that formed much of that country's eastern border.

Geography
The mountains marked the edge of Faerûn. The Sunrise Mountains were quite high, towering a good 15,000 feet above sea level and were full of old Raumathar ruins. Copper was mined in these mountains in 1359 DR.

A secret realm inhabited by gnomes, known as Songfarla the Hidden Kingdom, was located underneath the eastern slopes of these mountains.