The deepest portion of the Black Water, at the edge of which humans stopped building, and in which there are no major islands.
Strange predators live in that water since the Sundered Ones Appear, and cities near the edge of Deep Water have to deal with attacks from Sauros, Orcas, and Kraken.
The most well-known and important cities along that edge are the Cape Cities: Cape Horn, Cape Harm, Cape Hope, Cape Hand, and Cape Heart.