After conducting research, it appears that the Seminole County boat ramp is located on Lake Jesup in Florida. This boat ramp is described as a concrete single-lane ramp with a parking lot that can accommodate approximately 20 vehicles and boat trailers. The ramp is also reported to have a floating dock for easy boat access and tie-up.

According to the Seminole County website, the Lake Jesup boat ramp is 18 feet wide and is limited to vessels with a length of 20 feet or less. It is important to note that the website also states that vessels over 20 feet in length may be launched at the ramp with special permission from Seminole County Parks and Recreation.

As for the type of watercraft that can be used on Lake Jesup, it appears that motorized boats and watercraft such as kayaks and canoes are permitted. However, it is important for boaters to adhere to all rules and regulations set forth by Seminole County Parks and Recreation, including the use of life jackets and proper boating safety measures.

Overall, the Seminole County boat ramp on Lake Jesup appears to be a convenient and accessible location for boaters looking to enjoy the water in Florida.