Nantucket Shoals is an area of dangerously shallow water in the Atlantic Ocean that extends from Nantucket Island, Massachusetts, eastward for 23 miles (37 km) and southeastward for 40 miles (64 km); in places water depth can be as shallow as 3 feet (0.91 m).[1] Depth soundings are unpredictable due to constant change from strong currents. The shoals lie just off a major transatlantic shipping lane. Numerous ships have been wrecked here, most recent and notably the oil tanker Argo Merchant in December 1976. Until 1983, the edge of the shoals was guarded by the Nantucket Lightship.
Nantucket Shoals is made up of the following features:[2]
According to the 2010 edition of the United States Coast Pilot, the International Maritime Organization has established an "area to be avoided" for the Nantucket Shoals. Vessels transporting oil or hazardous materials and vessels of more than 1,000 gross tons should avoid the area bounded by the following points (Note: not for navigational use):[1]
| Point | Coordinates (links to map & photo sources) |
Notes |
|---|---|---|
| Madaket | ||
| Southwest point | ||
| Near Asia Rip | ||
| Near Fishing Rip | ||
| Northeast point | ||
| Great Point Light |