Sentinel Nature Preserve (WAN) is one of the California 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
Sentinel Nature Preserve (WAN) is in Marin County, California. Its approximate coordinates are 37.97270, -122.54347.
Check in at Sentinel Nature Preserve (WAN)
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.