How long is the global system of oceanic ridges?

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World map highlighting major features of the ocean basins, including trenches, ridges, basins, and plateaus labeled throughout the Pacific, Atlantic, Indian, Southern, and Arctic Oceans. Continents are shown with shaded terrain, and prominent undersea features such as the Mid-Atlantic Ridge, Mariana Trench, and Kerguelen Plateau are marked across the map. — ocean basin Major features of the ocean basins.

The global system of oceanic ridges is an interconnected network of submarine mountain chains that extends approximately 80,000 km (50,000 miles) through the world's oceans. Some scientific measurements have estimated the length of this system to be about 65,000 km (40,000 miles).12

These ridges represent the most prominent feature on Earth's surface after the continents and the ocean basins themselves. They are found in every ocean basin and are the sites where new oceanic crust is formed at seafloor spreading centres.13