Delaware Water Gap became a national recreational area (not, technically, a national PARK) in 1978.
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There is a National Park in every state except Delaware. For a full directory, visit www.nps.gov.
Though it has several state parks, Delaware is the only state with no national park units. It does, however, have a park trail passing through it (in addition to Virginia, Maryland, and DC).
As of March 25, 2013, all US states have a National Park Unit, however, not all of the units are a national park or monument. US states without a national park or monument are: Illinois (has an historic site) Kansas (has historic sites and a preserve) New Hampshire (has an historic site) Oklahoma (has a recreation area, an historic site, and a memorial) Rhode Island (has a memorial) Wisconsin (has a lake shore and a scenic river way)
The state of Delaware just recently gained their first national monument. In March of 2013, President Barack Obama created the First State National Monument, which is a National Park Service unit that lies in Delaware and also Pennsylvania.
The address of the Delaware And Lehigh National Herita is: 2750 Hugh Moore Park Rd, Easton, PA 18042-7120
The state that has the fewest national parks is the state of Delaware. The state is the only one in the US with no national park.
The Delaware Water Gap National Recreation Area is a fresh water area. It is located along the Delaware River, which is a freshwater river that runs through several states in the northeastern United States.