Rainoga

Lake Longreach is a cold, isolated body of water in the Moonsea North region of Faerûn, hidden in a mountain-ringed lowland east of the Ride. Surrounded on all sides by the jagged spines of the White Peaks, the West Galenas, and the Dragonspines, this closed lake is fed by frigid mountain streams—Telstang Brook, Naed Creek, and Razack’s Tears—and drains only southward, flowing past the ruins of Castle Vathar into the accursed Glumpen Swamp of Thar. Long untouched by civilization, Lake Longreach is steeped in dark legend: most notably as the resting place of Tyranthraxus, a warlord of pre-Upheaval antiquity whose disembodied spirit was sealed in a vial of radiant water and cast into its depths. The lake’s isolation and historical burden have long kept it shunned, and few venture to its shores save hermits, madmen, and those who seek power long buried.

The lake's dark, obsidian waters lie silent beneath towering mountain crowns, with sheer cliffs to the north and west and gentle tundra slopes to the south. Low mists cling to the surface until mid-morning and return at twilight, while faint unnatural shimmer pulses beneath the water, surrounded by overgrown ruins and boundary stones.