The Ayai'leh-hirh range is the largest mountain range on the planet Trill, and one of the largest on any inhabited planet known to Federation scientists as of the 2370s. In English, the name of the range translates to Five Thousand Valleys.

Mountains in the range include Arken, Ilrienh, Noraikghe, Oraidhe, and Sethe. (TNG novel: Intellivore)

In 2376, Ezri Dax saw the peaks of Ayai'leh-hirh in the distance as she piloted the USS Rio Grande towards the Caves of Mak'ala. (DS9 - Worlds of DS9 novel: Trill: Unjoined)

the planet Trillius Prime
cities and settlements BanaB'tarChi'tarGheryzanIklanKuralLeran ManevMak'alaMuronaNew ScirapoShatorTear'cTreshVransYmoc City UFP seal TrillEmblem
landmarks and geography Ayai'leh-hirh (Mount ArkenIlrienhNoraikgheOraidheSethe) • Caves of Mak'alaDeln MountainsDevritane MuseumDorabi subcontinentDorvan minesGanses PeninsulaHoobishan BathsIrnek PeninsulaKem'alta InstituteKorchub MountainsLekarna MountainsManevriNajana LibraryNalep MountainsTash MountainsTenarTenara (Tenaran Ice CliffsTenaran Music Academy) • Thorain MountainsTrill Senate TowerUrot MountainsVenar MountainsVor'lan mines
bodies of water Aldar BayDara'air OceanLake DevritaneLake OgralsManev BaySea of ArlibathTroyval OceanTurek SeaUzonn Ocean
lifeforms cutter termiteeomrekerfeather-apefenza birdilrienhmrekermudcrawlernoraikghesethesilikh flyskutfishyilga moth
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