The channel at Pollock Rip Shoals is centered about three miles (4.8 km) east of the southerly end of Monomoy Island in Chatham, Massachusetts.
[1] Vessels passing around the Cape Cod coastline use the channel as a passage from the Atlantic Ocean to Nantucket Sound.
[1] The Pollock Rip Lightship marked the eastern approach to the channel from 1849 to 1969; it has since been replaced by a lighted buoy.
The Stonehorse Lightship had previously identified the southeasterly end of the channel until October 1963, when it was removed by the U.S. Coast Guard and replaced with a small buoy.
[1] This article incorporates public domain material from Pollock Rip Shoals Navigation Project.