Following are the longest, widest, and deepest rifts and valleys in various worlds of the Solar System.
List WorldRift/ValleyLengthMax. widthMax. depthNotes Venus Baltis Vallis A lava channel Earth Atlantic Ocean ≈ ≈ 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 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 . Canadian Arctic Rift System A northwesterly continuation of the Mid-Atlantic Ridge. West Antarctic Rift System Midcontinent Rift System Width & depth Isle Royale – Keweenaw Peninsula; may not be widest point. Grand Canyon Colca Canyon Cotahuasi Canyon Moon Vallis Snellius ≈ ?Width assumed to be approx. that of Vallis Rheita Mars Valles Marineris Kasei Valles 2–3 kmTiu Valles Ares Vallis Vesta equatorial channels Possibly up to Length may be as much as the 1790-km circumference of VestaDivalia Fossae approx. ≈ 22 km Compression fracture from RheasilviaSaturnalia Fossae at least ≈ 39 km 365 km visible at one point; rest in northern shadow. Compression fracture from Veneneia. Europa ? ? More than Moon of Jupiter Tethys Ithaca Chasma 3–5 km (2–3 mi) Moon of Saturn. Ithaca span approx. 75% the circumference of the Moon.CharonArgo Chasma700 km (430 mi)?9 km (6 mi)Moon of Pluto. Part of a belt of grabens that span most of the circumference of the moon. Only a section was seen on limb of Charon and so exact length uncertain. Not yet officially named.Caleuche Chasma ? Depth estimated in the range .Mirandatectonic grabens20 km10-20 kmExtensive series of grabens and scarps that cover most of the moon.TitaniaMessina Chasma1492 km (900 mi)50 km (30 mi)2-5 kmGeologically young belt of grabens that cut through craters. Bright, icy material exposed on canyon walls.Pluto Sleipnir Fossa580 km (360 mi)5-10 km≈3 km (2 mi)One of the six extensional "spider" fractures, cuts through Tartarus Dorsa . Not yet officially named.Lowell Regio canyons≈200 km (120 mi)75 km (45 mi)≈3-4 km A series of canyons found very close to the north pole. Not yet officially named.
See also List of Solar System extremes List of largest craters in the Solar System List of tallest mountains in the Solar System List of largest lakes and seas in the Solar System
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