Popponesset Bay System is a group of bays located at the towns of Mashpee (north & west) and Barnstable (east), on Cape Cod, Massachusetts with a southern shore bounded by water from Nantucket Sound.
Popponesset Bay has the following tributary sub-embayments:
Ockway Bay
Shoestring Bay
Mashpee River Estuary
Pinquickset Cove
The bay system is fed by the Mashpee River and Santuit River. Popponesset Creek is not a tributary but rather connects with the bay on both ends and separates Popponesset Island from the mainland.
