EARLIEST HYDROLOGICAL chart of Florida coastal waters is this undated and unsigned specimen which may have been drawn sometime between the Arredondo map of 1742 when the continental shelf was first noted and 1757 when Celi first determined the true shape and size of Tampa Bay. The name Sanibel appears as a river as it does on early U.S. military maps as an alternate name for Caloosahatchee River. Unfortunately the soundings in fathoms is inconclusive for shallow water. (Spanish Directorate Hydrographia, Madrid)
1449 x 1660 Pixels