The Gakkel Ridge (formerly known as the Nansen Cordillera and Arctic Mid-Ocean Ridge) is a mid-oceanic ridge, a divergent tectonic plate boundary between the North American Plate and the Eurasian Plate."GPS Measurements Reveal Imprint of North American Plate in Siberia", Earth Institute at Columbia University, 2003 It is located in the Arctic Ocean between Greenland and Siberia, and has a length of about 1,800 kilometers.