<P> Within Plymouth Bay itself there are considered two smaller bays, Kingston Bay and Duxbury Bay, both in the northern waters of Plymouth Bay, and Warren Cove, in the southern waters of Plymouth Bay, located between Plymouth Beach and Rocky Point . </P> <P> Several peninsulas define the shoreline of Plymouth Bay such as Rocky Nook, a densely populated coastal area of Kingston, and Powder Point of Duxbury . Plymouth Bay contains one island with year - round inhabitants, Clarks Island, in the northern portion of the bay and is administered by Plymouth . Plymouth Bay also acts as the mouth for several important rivers in the region such as the Jones River in Kingston and the Eel River in Plymouth . </P> <P> Although used for boating, Plymouth Bay itself is relatively shallow . Depths in the bay will range from 35 feet, in the deepest channels west of Fort Standish, to 6 to 42 inches throughout much of the bay's rolling mud flats . </P> <P> Most of Plymouth Bay's mud flats can be found in Kingston Bay and Duxbury Bay, which are prone to becoming totally exposed in times of low tide . The largest of these such flats is Ichabod's Flat in Kingston Bay . The mud flats of Kingston Bay are used for shellfishing and clamming and have flourished due to Plymouth Bay's ability to isolate itself from red tide, which occasionally impacts the Massachusetts coastline . </P>

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