# Echoriath Montes
**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.[1](https://planetarynames.wr.usgs.gov/Feature/14894) • [2](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/)
| Key fact | Detail |
|---|---|
| Feature type | Mons, montes (a mountain range) on Titan, Gazetteer Feature ID 14894[1](https://planetarynames.wr.usgs.gov/Feature/14894) |
| Size and position | Diameter 930.00 km; center at 7.40° south latitude, 213.80° west longitude (planetographic, +West)[1](https://planetarynames.wr.usgs.gov/Feature/14894) |
| IAU approval | Adopted December 5, 2011; ethnicity listed as England[1](https://planetarynames.wr.usgs.gov/Feature/14894) |
| 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)[1](https://planetarynames.wr.usgs.gov/Feature/14894) |
| Sindarin meaning | Echoriath means "encircling fence", from *echor* ("encircling") and *iâth* ("fence")[3](https://tolkiengateway.net/wiki/Echoriad) |
| 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)[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) |
## Location and observation
The 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.[1](https://planetarynames.wr.usgs.gov/Feature/14894) 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.[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)
**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.[5](https://www.sciencedirect.com/science/article/abs/pii/S0019103515005382) 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.[6](https://science.nasa.gov/photojournal/mountains-on-the-northwest-border-of-xanadu-titan/) 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.[7](https://www.sciencedirect.com/science/article/abs/pii/S0019103507002771)
## The name
The 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.[1](https://planetarynames.wr.usgs.gov/Feature/14894) In Tolkien's legendarium, the Echoriath, also called the Encircling Mountains or the Mountains of Turgon, are a range in the north of Beleriand.[3](https://tolkiengateway.net/wiki/Echoriad) 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.[3](https://tolkiengateway.net/wiki/Echoriad)
**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.[8](https://www.usgs.gov/tools/gazetteer-planetary-nomenclature)
## Mountains on Titan
Titan'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.[2](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/) [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.[9](https://www.sciencedirect.com/science/article/abs/pii/S0019103508003874)
Several 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.[7](https://www.sciencedirect.com/science/article/abs/pii/S0019103507002771) 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.[6](https://science.nasa.gov/photojournal/mountains-on-the-northwest-border-of-xanadu-titan/) Summit morphologies and diffuse blankets around peaks give evidence that erosion, perhaps fluvial runoff of liquid hydrocarbons, has acted on these terrains.[7](https://www.sciencedirect.com/science/article/abs/pii/S0019103507002771)
## Tolkien's names on Titan
Echoriath 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,[2](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/) 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.[10](https://pds-rings.seti.org/cassini/report/Cassini%20Final%20Report%20-%20Volume%201%20-%20RADAR.pdf) 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.[2](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/)
## References
1. [Echoriath Montes, Gazetteer of Planetary Nomenclature, USGS Astrogeology Science Center](https://planetarynames.wr.usgs.gov/Feature/14894)
2. [Cassini Spies Titan's Tallest Peaks, NASA Science](https://science.nasa.gov/missions/cassini/cassini-spies-titans-tallest-peaks/)
3. [Echoriad, Tolkien Gateway](https://tolkiengateway.net/wiki/Echoriad)
4. [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)
5. [The tectonics of Titan: Global structural mapping from Cassini RADAR, Icarus](https://www.sciencedirect.com/science/article/abs/pii/S0019103515005382)
6. [Mountains on the Northwest Border of Xanadu, Titan, NASA Science](https://science.nasa.gov/photojournal/mountains-on-the-northwest-border-of-xanadu-titan/)
7. [Mountains on Titan observed by Cassini Radar, Icarus](https://www.sciencedirect.com/science/article/abs/pii/S0019103507002771)
8. [Gazetteer of Planetary Nomenclature, USGS Astrogeology Science Center](https://www.usgs.gov/tools/gazetteer-planetary-nomenclature)
9. [Analysis and interpretation of Cassini Titan radar altimeter echoes, Icarus](https://www.sciencedirect.com/science/article/abs/pii/S0019103508003874)
10. [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)
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*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*
*Initially written Oct 21, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license