Bittertide Lake is located in northwest Sholazar Basin, bordered by the Mistwhisper Refuge to the north, the Wildgrowth Mangal to the east, Swindlegrin's Dig to the south, the Makers' Perch to the southwest and Sholazar's border with the sea to the west. Fed by an unnamed stream coming from the sea, Bittertide is inhabited by hydra.
Strong currents will pull a swimmer under, but they can be overcome with some effort. Underwater Saronite Nodes are a challenge, how can you mine a node when you are constantly moving?