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 "title": "Echoriath Montes",
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 "excerpt": "Echoriath Montes, a mountain range on Saturn's moon Titan, IAU-approved in 2011 and named for Tolkien's Encircling Mountains of Beleriand; about 930 km across near the equator, mapped by Cassini radar.",
 "snippet": "Echoriath Montes, a mountain range on Saturn's moon Titan, IAU-approved in 2011 and named for Tolkien's Encircling Mountains of Beleriand; about 930 km across near the equator, mapped by Cassini radar.",
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 "markdown": "# Echoriath Montes\n\n**Echoriath Montes** is a mountain range on Titan, Saturn's largest moon, approved by the International Astronomical Union in 2011 and named after the Encircling Mountains of J.R.R. Tolkien's [Middle-earth](https://www.edgepedia.org/middle-earth). The range lies near Titan's equator, spans roughly 930 km, and was mapped by the Cassini spacecraft's radar instrument, which can image the surface through the moon's opaque, smoggy atmosphere.<sup>[1](https://planetarynames.wr.usgs.gov/Feature/14894)</sup><sup> • </sup><sup>[2](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/)</sup>\n\n| Key fact | Detail |\n|---|---|\n| Feature type | Mons, montes (a mountain range) on Titan, Gazetteer Feature ID 14894<sup>[1](https://planetarynames.wr.usgs.gov/Feature/14894)</sup> |\n| Size and position | Diameter 930.00 km; center at 7.40° south latitude, 213.80° west longitude (planetographic, +West)<sup>[1](https://planetarynames.wr.usgs.gov/Feature/14894)</sup> |\n| IAU approval | Adopted December 5, 2011; ethnicity listed as England<sup>[1](https://planetarynames.wr.usgs.gov/Feature/14894)</sup> |\n| Namesake | A mountain range from Middle-earth, the fictional setting of Tolkien's fantasy novels; cited reference is Robert Foster's *The Complete Guide to Middle-earth* (Ballantine Books, 1978)<sup>[1](https://planetarynames.wr.usgs.gov/Feature/14894)</sup> |\n| Sindarin meaning | Echoriath means \"encircling fence\", from *echor* (\"encircling\") and *iâth* (\"fence\")<sup>[3](https://tolkiengateway.net/wiki/Echoriad)</sup> |\n| Cassini observations | Imaged by synthetic aperture radar during the T8 flyby (October 2005) and by the VIMS infrared spectrometer during the T29 flyby (April 2007)<sup>[4](https://www.researchgate.net/profile/Bernard-Schmitt/publication/329801370_Titan%27s_Major_Geomorphological_Units_Their_Spectral_and_Morphological_Nature/links/5c2e79e5a6fdccd6b58f90ec/Titans-Major-Geomorphological-Units-Their-Spectral-and-Morphological-Nature.pdf)</sup> |\n\n## Location and observation\n\nThe Gazetteer of Planetary Nomenclature places the range between 6.20° and 8.80° south latitude and between 204.80° and 224.50° west longitude, in Titan's low-latitude region.<sup>[1](https://planetarynames.wr.usgs.gov/Feature/14894)</sup> A spectral study of Titan's mountains and channels lists the region at 7.6°S, 215°W, with radar coverage from the T8 flyby of October 2005 and infrared mapping from the T29 flyby of April 2007.<sup>[4](https://www.researchgate.net/profile/Bernard-Schmitt/publication/329801370_Titan%27s_Major_Geomorphological_Units_Their_Spectral_and_Morphological_Nature/links/5c2e79e5a6fdccd6b58f90ec/Titans-Major-Geomorphological-Units-Their-Spectral-and-Morphological-Nature.pdf)</sup>\n\n**Radar mapping.** Titan is shrouded in a thick, hazy atmosphere, so its surface is mapped primarily by the Cassini RADAR instrument, a 2.17 cm Ku-band radar that records both synthetic aperture radar images and altimetry.<sup>[5](https://www.sciencedirect.com/science/article/abs/pii/S0019103515005382)</sup> In radar images, surfaces appear bright when they are tilted toward the spacecraft or are rough, which makes mountain ridges stand out against the surrounding plains.<sup>[6](https://science.nasa.gov/photojournal/mountains-on-the-northwest-border-of-xanadu-titan/)</sup> A survey of mountains observed during the T3 (February 2005) and T8 (October 2005) flybys, the same period in which Echoriath Montes was imaged, measured summit flanks with a mean maximum slope of 37° and total elevations up to 1,930 m, derived from a shape-from-shading model corrected for image resolution.<sup>[7](https://www.sciencedirect.com/science/article/abs/pii/S0019103507002771)</sup>\n\n## The name\n\nThe IAU approved the name on December 5, 2011, recording the origin as \"Name of a mountain range from Middle-earth, the fictional setting in fantasy novels by J.R.R. Tolkien\", with Robert Foster's *The Complete Guide to Middle-earth* (Ballantine Books, New York, 1978) as the cited reference.<sup>[1](https://planetarynames.wr.usgs.gov/Feature/14894)</sup> In Tolkien's legendarium, the Echoriath, also called the Encircling Mountains or the Mountains of Turgon, are a range in the north of Beleriand.<sup>[3](https://tolkiengateway.net/wiki/Echoriad)</sup> The name is Sindarin for \"encircling fence\", from *echor* (\"encircling\") and *iâth* (\"fence\"); Tolkien also gave the range the alternate form Eryd Echor, and an early version in *The Book of Lost Tales* called it Heborodin.<sup>[3](https://tolkiengateway.net/wiki/Echoriad)</sup>\n\n**How the name was adopted.** Planetary features are named only when members of the professional science community have a specific scientific need, such as preparing peer-reviewed manuscripts or maps; requests go to the USGS Astrogeology Science Center, which maintains the Gazetteer on behalf of the IAU's Working Group for Planetary System Nomenclature, the approving body for planetary names.<sup>[8](https://www.usgs.gov/tools/gazetteer-planetary-nomenclature)</sup>\n\n## Mountains on Titan\n\nTitan's mountains are modest by Earth standards. A 2016 Cassini analysis identified the moon's tallest peak, 3,337 m high, within the [Mithrim Montes](https://www.edgepedia.org/mithrim-montes), and found that all of Titan's highest peaks reach about 3,000 m in elevation, with most of the tallest mountains close to the equator.<sup>[2](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/)</sup> [Radar altimeter](https://www.edgepedia.org/radar-altimeter) passes across Titan show mountains of several hundred meters' altitude spreading over tens to hundreds of kilometers, so slopes are gentle, and large expanses of sub-100 m topography make the surface rather smooth in many locations.<sup>[9](https://www.sciencedirect.com/science/article/abs/pii/S0019103508003874)</sup>\n\nSeveral formation mechanisms have been proposed for Titan's mountains: crustal compressional tectonism and upthrusting of blocks, extensional tectonism forming horst-and-graben terrain, deposition as blocks of impact ejecta, or dissection and erosion of a preexisting layer of material.<sup>[7](https://www.sciencedirect.com/science/article/abs/pii/S0019103507002771)</sup> Elsewhere on Titan, parallel mountain chains along the northwest border of [Xanadu](https://www.edgepedia.org/xanadu) are interpreted as the result of the lithosphere, the outermost icy layer, folding up during deformation, with the tallest features rising about 1,900 m above the surrounding plains.<sup>[6](https://science.nasa.gov/photojournal/mountains-on-the-northwest-border-of-xanadu-titan/)</sup> Summit morphologies and diffuse blankets around peaks give evidence that erosion, perhaps fluvial runoff of liquid hydrocarbons, has acted on these terrains.<sup>[7](https://www.sciencedirect.com/science/article/abs/pii/S0019103507002771)</sup>\n\n## Tolkien's names on Titan\n\nEchoriath Montes belongs to a Tolkien-themed naming tradition on Titan. Other IAU-approved features include the Mithrim Montes, home of Titan's tallest known peak,<sup>[2](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/)</sup> Doom Mons, about 70 km in diameter and 1.5 ± 0.2 km high, and Erebor Mons, both in a region studied for possible cryovolcanic activity.<sup>[10](https://pds-rings.seti.org/cassini/report/Cassini%20Final%20Report%20-%20Volume%201%20-%20RADAR.pdf)</sup> A 2016 update to NASA's map of named Titan mountains added the [Moria Montes](https://www.edgepedia.org/moria-montes) along with several \"colles\", collections of hills.<sup>[2](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/)</sup>\n\n## References\n\n1. [Echoriath Montes, Gazetteer of Planetary Nomenclature, USGS Astrogeology Science Center](https://planetarynames.wr.usgs.gov/Feature/14894)\n2. [Cassini Spies Titan's Tallest Peaks, NASA Science](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/)\n3. [Echoriad, Tolkien Gateway](https://tolkiengateway.net/wiki/Echoriad)\n4. [The Spectral Nature of Titan's Major Geomorphological Units: Constraints on Surface Composition (Schmitt et al.)](https://www.researchgate.net/profile/Bernard-Schmitt/publication/329801370_Titan%27s_Major_Geomorphological_Units_Their_Spectral_and_Morphological_Nature/links/5c2e79e5a6fdccd6b58f90ec/Titans-Major-Geomorphological-Units-Their-Spectral-and-Morphological-Nature.pdf)\n5. [The tectonics of Titan: Global structural mapping from Cassini RADAR, Icarus](https://www.sciencedirect.com/science/article/abs/pii/S0019103515005382)\n6. [Mountains on the Northwest Border of Xanadu, Titan, NASA Science](https://science.nasa.gov/photojournal/mountains-on-the-northwest-border-of-xanadu-titan/)\n7. [Mountains on Titan observed by Cassini Radar, Icarus](https://www.sciencedirect.com/science/article/abs/pii/S0019103507002771)\n8. [Gazetteer of Planetary Nomenclature, USGS Astrogeology Science Center](https://www.usgs.gov/tools/gazetteer-planetary-nomenclature)\n9. [Analysis and interpretation of Cassini Titan radar altimeter echoes, Icarus](https://www.sciencedirect.com/science/article/abs/pii/S0019103508003874)\n10. [Cassini Final Report, Volume 1: RADAR (PDS Rings Node)](https://pds-rings.seti.org/cassini/report/Cassini%20Final%20Report%20-%20Volume%201%20-%20RADAR.pdf)\n\n---\n*Topic: Encyclopedia › Places and geography › Extraterrestrial places › Planetary surfaces and named features › Features on outer-planet moons › Saturnian moon features › Titan surface features › Montes and mountains*\n\n*Initially written Oct 21, 2026*\n\n*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*\n\nLicense: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license\n",
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 "credit": "\"Echoriath Montes\", Edgepedia (EdgeChat), https://www.edgepedia.org/echoriath-montes. Edgepedia Community License 1.0.",
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 "speakable": "Echoriath Montes, a mountain range on Saturn's moon Titan, IAU-approved in 2011 and named for Tolkien's Encircling Mountains of Beleriand; about 930 km across near the equator, mapped by Cassini radar."
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