Lower New York Bay is a section of New York Bay south of the Narrows, the relatively narrow strait between the shores of Staten Island and Brooklyn. The southern end of the bay opens directly to the Atlantic Ocean between two spits of land, Sandy Hook, New Jersey, and Rockaway, Queens, on Long Island. The southern portion between Staten Island and New Jersey, at the mouth of the Raritan River, is named Raritan Bay. The Hudson Canyon, the ancient riverbed of the Hudson River which existed during the last ice age when the ocean levels were lower, extends southeast from Lower New York Bay for hundreds of miles into the Atlantic Ocean.