National Geographic : 2009 May
Exploring north of Alaska in several trips, the Healy used multibeam sonar to map the Northwind Ridge and beyond. This and other continental formations under the Arctic Ocean may allow the U.S. to claim hundreds of thousands of square miles of additional territory. UNITED STATES ALASKA CONTINENTAL SLOPE OCEAN FLOOR Boundary between continental slope and ocean floor HEALY SEAMOUNT depth 3,084 ft (940 m) Depth measured along the Healy tracks CONTINENTAL SHELF NORTHWIND RIDGE Barrow IMAGE BY LARRY A. MAYER, CENTER FOR COASTAL AND OCEAN MAPPING/NOAA UNH JOINT HYDROGRAPHIC CENTER, UNIVERSITY OF NEW HAMPSHIRE Healy tracks 2003--2008 meters 0 0 feet 2,000 4,000 6,000 8,000 10,000 12,000 12,467 1,000 2,000 3,000 3,500 2,500 1,500 3,800 500 Scale varies in this perspective. The distance between Barrow and the Healy Seamount is 510 miles. depth 12,556 ft (3,827 m) THIS VIEW IS FROM THE NORTH LOOKING SOUTH.