The Ice Flow
 
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FR5 The Savage Frontier - Forgotten Realms - 1st Edition AD&D

This chilling, fast-rushing river thunders <Flowing Water>
down out of the icy interior of the
Sword Coast's northernmost extent,
marking the beginning of the Cold Run.
Its unnavigable waters are just above
freezing and travel at terrifying speed
through a great ice gorge. In spring and
high summer, great slabs of ice break
off the gorge walls and fall into the
water, shattering with the force of a triple
strength ice storm, spraying the
vicinity with boulders of broken ice.
These chunks are swept down the
gorge and out to sea, to drift south amid
great icebergs from the Sea of Moving
Ice. Remorhaz are known to lair nearby
and great horrors known as ?ice or
snow spiders? have also been encountered.

No rich ores have been found here,
but there are persistent rumors of
incredibly ancient ruins and buried
riches in secret places in the gorge.