range from more than 100 feet in the upland to less than 25 feet in the lowland. In the northeastern and eastern part of the county and along the south shore of Lake Jessup the land rises abruptly into the upland area. The upland area is undulating and has many lakes that occupy depressions, probably formed by the solution of the underlying limestone. Lake Jessup, Lake Monroe, and Lake Harney are the largest lakes in the county and probably fill original depressions in the floor of the sea that once covered this area. It has been suggested that the depression in which Lake Jessup lies was formed in part by old stream meanders, antedating the last invasion of the sea. Lake Jessup, about 9 miles long and 3 miles wide, extends from the central part of the county northward
to the St. Johns River, Lake Monroe, and Lake Harney are the course of the St. Johns.
Drainage
The St. Johns River controls the drainage of the county. It
forms the east and north boundary and flows northward to the northeastern part of the State and thence into the Atlantic Ocean. The Wekiva River forms part of the west boundary of the county and flows northward into the St. Johns River. The Little Wekiva River rises in the southwestern part of the county and flows northward into the Wekiva. Palm Spring and Sanlando Springs are the tributaries to it. Lake Jessup and the creeks that empty into it afford drainage for the central part of the county.
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Leverett, Frank, The Pensacola terrace and associated beaches and bars in Florida: Florida Geol. Survey Bull. 7, p. 12, 1931.
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