These highly detailed freshwater maps include 17,000+ U.S. lakes, rivers and reservoirs. Included in those are more than 5,700 HD lakes with 1’ contours shoreline to shoreline; excellent detail of underwater features plus Safety Shading that allows you to designate a minimum depth; interstates, highways, general roads and bridges; designated fishing areas; and points of interest, such as docks, boat ramps, marinas and campgrounds.