Pathfinder: Legacy of Fire
The Hammerfalls, fed by melting snow high in the Brazen Peaks, cascade down from the mountains, roaring over tall cliffs and foaming through tiers of rapids down toward the Pale River, where the swirling white waters calm somewhat before flowing past Kelmarane and the open plains. The distant roaring of the falls is audible day and night in the nearby passes and canyons, and the rapids are all but impossible to navigate by boat, except for extremely small and nimble craft; even then, frequent portages are necessary to avoid the falls and jagged rocks able to rend hulls and flesh with equal ease.
This area used to be the home to dozens of dwarven clans who have long since disappeared. The area is now infested with goblins. Somewhere among the Hammerfalls is a long lost dwarven fortress and mine, the Halls of Hammerfalls.