Final answer:
Nebraska is the state home to Lewis and Clark Lake, Harlan Country Lake, and Lake C.W. McConaughy, which are important recreational sites.
Step-by-step explanation:
The state with Lewis and Clark Lake, Harlan Country Lake, and Lake C.W. McConaughy is Nebraska. These lakes are significant geographical features in Nebraska, offering a range of recreational activities. Lewis and Clark Lake is located on the border between Nebraska and South Dakota, formed by the Gavins Point Dam on the Missouri River. Harlan County Lake is Nebraska's second-largest lake, located in the southern part of the state. Finally, Lake C.W. McConaughy, often simply referred to as Lake McConaughy, is the largest lake in Nebraska, situated in the western region of the state and famously known for its white sandy beaches and clear blue waters.