 Their territory extended from about the Altamaha River in Georgia to south of St. Augustine, Florida, covering the Sea Islands and the inland waterways, including the mouth of the St. Johns River in present-day Jacksonville and the Intracoastal.At the time of contact with Europeans, there were two major chiefdoms among the Mocama, the Saturiwa and the Tacatacuru, each of which evidently had authority over multiple villages.The Spanish came to refer to the entire area as the Mocama Province, and incorporated it into their mission system.