Sour Sea

The Sour Sea is a foul bay of polluted water which runs into the Bitter Sea. Ages ago, a great chunk of warpstone plummeted into Cripple Peak, shattering the mountain. Since then, years of water and wind erosion has caused warpstone dust to seep into the waters, poisoning them forever.

Source

 * White Dwarf #249 October 2000, pg. 37