Clarke's Landing Boat Ramp is a public boat ramp located in St. Mary's County, Maryland. It provides access to the Patuxent River, which is a tidal river that flows into the Chesapeake Bay. The boat ramp is a concrete launch with a single lane and is about 18 feet wide, making it suitable for smaller watercraft such as kayaks, canoes, and smaller powerboats.

According to the Maryland Department of Natural Resources, Clarke's Landing Boat Ramp has a maximum launching depth of 3 feet at mean low tide and can accommodate boats up to 20 feet in length. The ramp is open year-round, 24 hours a day, and there is no fee for launching.

In terms of amenities, Clarke's Landing Boat Ramp has a small parking lot with about 10 spaces for vehicles with trailers. There is also a floating dock adjacent to the ramp that can be used for loading and unloading passengers and gear.

Overall, Clarke's Landing Boat Ramp is a relatively small and basic facility, but it provides convenient access to the Patuxent River for smaller boats and is an important resource for local boaters and anglers.