Common Ground is one of the New Hampshire parks in thicket's catalog. thicket is a field guide to the parks near you: it maps the ones you have never noticed, gives you a reason to actually go, and keeps a record of where you have been.
Where it is
Common Ground is in Rockingham County, New Hampshire. Its approximate coordinates are 42.92784, -70.92690.
Check in at Common Ground
thicket verifies you are actually here by GPS when you check in, so a visit means you went. Checking in builds a streak, earns achievements, and fills in your map of the places you have been.