I ve been going there for years, if ypu wanta nice place to walk and see nature, its a hidden treasure, and anyone on PG county should try it jus nice to get out for a walk.
Be prepared to spend hours. Great place to go in Upper Marlboro. I didn't realize how rural Upper Marlbor is. Beauiful place to watch species of Birds and waterfowl. Well worth the trek.
Merkle is an excellent bird sanctuary that our Audubon Club likes to do at least once a year. The trails are well maintained and there is an excellent center with a deck that looks out over the fields of birds gathering for a winter's stay. Bring a lunch and stay a while. It is a very peaceful place to enjoy nature.