The barrier peninsula extends for about 1.0 mile (1.6 km) from the community of Popponesset in Mashpee on Cape Cod in Massachusetts and is part of the coastline known as Popponesset Beach.
[5][6] The peninsula is now significantly shorter than seen in the Barnstable County survey of 1880.
Portions of the shore have been stabilized with riprap to deter further erosion.
Most of this work was done immediately after Hurricane Bob which in 1992 had opened an inlet through the beach.
The peninsula is home to bird sanctuary and other conservation projects[7] that prevent disturbance of the piping plover, an endangered species, and terns.