The Brinic is a warm and shallow sea named for its extremely high salt content. Though the Brinic is open to the ocean, it is extremely shallow at the mouth, and at low tide one could almost walk from Agartha to West Meridia without any need to swim. Because of this, evaporation raises the salinity of the Brinic much faster than it can be diluted by incoming seawater, and there is almost no fish life in the Brinic at all.
The north shore of the sea is lined with salt marshes in the east, and while no human or other known races have ever settled there, sailors tell of seeing lights wandering through the marshes on warm summer evenings. The lights are considered an ill omen, and sailors who see them make habit of sailing for the nearest port to make offering to their gods. Peoples of the south shore mine the vast mineral resources of the Brinic, particularly along the cliffs of northern West Meridia, and due to the rare compounds found along these shores, alchemists are common here. The Brinic has long been the supplier of a wide variety of products, from balms for Thelemic mummification to potash for fertilizers. People also use the salt and the minerals from the Brinic to create cosmetics and herbal poultices.