List of largest rifts and valleys in the Solar System

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Following are the longest, widest, and deepest rifts and valleys in various worlds of the Solar System.

World Rift/Valley Length Max. width Max. depth Notes
Venus Baltis Vallis 068006,800 km (4,200 mi) 00033 km (2 mi) A lava channel
Earth Atlantic Ocean 10000 ≈10,000 km (6,000 mi) 06000 ≈6,000 km (4,000 mi) 0787.758 km (4.821 mi) Length taken to be that of the Mid-Atlantic Ridge. (The ridge also has a secondary rift valley running its length.) The width is an average taken along the spreading ridges (Georgia–Senegal, Brazil – Bight of Benin, etc.). The greatest depth is the Romanche Trench. (The Puerto Rico Trench is not part of the rift system.)
Great Rift Valley 06000 6,000 km (3,700 mi) 00220 220 km (140 mi) 02 2 km (1 mi) Width and depth are those of the Red Sea Rift, discounting continental shelves < 200 m deep. (These may not be the extremes of the whole rift system.) Length of the Red Sea section 2,250 km (1,400 mi).
West Antarctic Rift
Keweenawan Rift 02000 2,000 km (1,200 mi) 00070 70 km (40 mi) 0027 0.27 km (0.17 mi) Width & depth Isle RoyaleKeweenaw Peninsula; may not be widest point.
Colca Canyon 04164.160 km (2.58 mi)
Cotahuasi Canyon 03543.535 km (2.197 mi)
Moon Vallis Snellius 00592 592 km (368 mi) 00030 ≈ 30 km (20 mi)? Width assumed to be approx. that of Vallis Rheita
Mars Valles Marineris 04000 3,769 km (2,342 mi) 00200 200 km (100 mi) 0400 7 km (4 mi)
Kasei Valles 01780 1,780 km (1,110 mi) 00200 200 km (100 mi) 025 2–3 km
Tiu Valles 01780 1,720 km (1,070 mi)
Ares Vallis 01700 1,700 km (1,100 mi)
Vesta equatorial channels 01700 Possibly up to 1,700 km (1,100 mi) Length may be as much as the 1790-km circumference of Vesta
Divalia Fossa 00465 approx. 465 km (290 mi) ≈ 22 km Compression fracture from Rheasilvia
Saturnalia Fossa 00365 at least 365 km (230 mi) ≈ 39 km 365 km visible at one point; rest in northern shadow.[1]
Compression fracture from Veneneia.
Europa  ?  ? 00020 More than 20 km (10 mi) Moon of Jupiter
Tethys Ithaca Chasma 020002,000 km (1,000 mi) 00100100 km (60 mi) 04003–5 km (2–3 mi) Moon of Saturn. Ithaca span approx. 75% the circumference of the moon.

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