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Western Hemisphere
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Western Hemisphere
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Western Hemisphere
Western Hemisphere

Western Hemisphere

geography
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News •

Trump wants to redraw the map of the Western Hemisphere • Jan. 8, 2025, 6:02 AM ET (CNN)
Rare and Giant Steller's Sea Eagle Spotted Thousands of Miles From Home in Eastern Canada Park • Jan. 3, 2025, 8:55 AM ET (Smithsonian Magazine)

Western Hemisphere, part of Earth comprising North and South America and the surrounding waters. Longitudes 20° W and 160° E are often considered its boundaries. Some geographers, however, define the Western Hemisphere as being the half of Earth that lies west of the Greenwich meridian (prime meridian, 0° longitude) continuing to the 180th meridian. According to this scheme, the Western Hemisphere includes not only North and South America but also portions of Africa, Europe, Antarctica, and Asia.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Jeff Wallenfeldt.