CFR /  Title 46  /  Part 7  /  Sec. 7.20 Nantucket Sound, Vineyard Sound, Buzzards Bay,to Long Island Sound, NY.

(a) A line drawn from Chatham Light to latitude 4136.1 N. longitude 6951.1 W. (Pollack Rip Entrance Lighted Horn Buoy ``PR''); thence to latitude 4126.0 N. longitude 6946.2 W. (Great Round Shoal Channel Lighted Buoy ``2''); thence to Sankaty Head Light.

(b) A line drawn from the westernmost extremity of Nantucket Island to the southwesternmost extremity of Wasque Point, Chappaquiddick Island.

(c) A line drawn from Gay Head Light to Block Island Southeast Light; thence to Montauk Point Light on the easterly end of Long Island.