Nelson's located in Umatilla, FL on the Ocklawaha River. We serve Breakfast, Lunch and Dinner. Lot's to do - Check us Out! The Ocklawaha River, the largest tributary of the St. Johns River is one the primary rivers in the state of Florida. Originating from the waters of the Green Swamp, Lake Griffin, Lake Eustis, Lake Harris, Lake Dora and Lake Apopka, the Ocklawaha River is one of the few of the continent's major rivers to flow northward. It travels for about 80 miles along the western and northern boundary of the Ocala National Forest before merging with the St. Johns River. The river itself is contained within Marion County while its drainage basin strays into Alachua County, Putnam County and Orange County Nelson's Outdoor Resort, formerly known as Nelson's Fish Camp, has been