Crystal Lake is a lake directly east of Goldshire in Elwynn Forest. It is crawling with murlocs, and may be quite dangerous for an inexperienced adventurer.
Trivia
In Demon Soul, players like to use the Deviate Ninja Transformation to look more like Jason and rise up out of the lake.
Inspiration
It may be named after the infamous Crystal Lake from the Friday the 13th movies. An NPC named Jason Mathers is nearby.