The Thunder Peaks were a range of mountains that ran in a north–south line, marking the eastern edge of Cormyr. The entire range was subject to extremely severe and sudden storms all year round. They were home to tribes of orcs and goblins that launched raids in nearby Cormyr, Sembia, and the Dalelands, and were also home to the dracolich Aurgloroasa, the Sibilant Shade. The Thunder Peaks once hosted the dwarven settlement of Thunderholme.
The mountains had a number of unique species of plants, including the turis and kirin trees, as well as Bowen's flowers. The scent of the heavily aromatic ateris plants would blow down to the town of Tilverton with strong winds.
According to the Treatise Historical of the Dragon Tyrants, after the first Rage of Dragons, their kobold servitors were all but destroyed in the rampaging chaos of their masters. Kuraulyek, a dragonwrought kobold, led his winged kin to safety in the Thunder Peaks, escaping the dragons' wrath in the bat-filled caverns.
- The Iron Maidens, a band of female-only mercenaries, had their fortress in a formerly deserted castle hidden somewhere in the mountains.
- The High Dale was nestled in a steep mountain pass in the Thunder Peaks. The most notable settlement of the High Dale was Highcastle, home to High Dale's ruling body.
- The Dancing Place, sacred location where the Gathering of the Gods took place, was located in a hidden valley a few miles north-east of Highcastle.
- Wyvernfang: This summit at the apex the Thunder Peaks served as roost to a number of Wyverns who would ambush travelers along the Thunder Way.
- Manymists Mountain: This summit located east of the Dancing Place was rich with silver ore.
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- The Glass Prison
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- Costa Valhouli (September 1990). “The New Rogues Gallery: Iron Maidens”. In Jean Rabe ed. Polyhedron #55 (TSR, Inc.), p. 19.
- Ed Greenwood (January 1996). Volo's Guide to the Dalelands. (TSR, Inc), p. 155. ISBN 0-7869-0406-2.
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Daggerdale • Featherdale • High Dale • Mistledale • Shadowdale
Moondale • Sessrendale • Tarkhaldale • Teshendale
Arch Wood • Cormanthor • Darkwatch • Spiderhaunt Wood • Velarswood • Yevenwood
Bodies of Water
River Arkhen • River Ashaba • Feather Falls • Dragon Reach • Lake Eredruie • Glaemril
Dun Hills • Thunder Peaks • Wyvernfang
Barrowfields • Cold Field • Druid's Grove • Glaun Bog • Hidden Vale • The Scar