Region
Maryland
Aberdeen Proving Ground
7
Aberdeen Proving Ground (Md.)
3
Anne Arundel County
1
Catoctin Mountain Region
1
Chesapeake Bay (Md. and Va.)
1
Conowingo Dam (Md.)
1
Jones Falls
1
Morgan Creek Watershed (Kent County)
1
Morgan Creek Watershed (Kent County, Md.)
1
Susquehanna River
1
Susquehanna River Watershed
1