Primedian was a location on the Romulan homeworld of Romulus.

Post 2379, Ambassador Spock staged his murder at Primedian in an attempt at accelerating his plans for Reunification. (TOS novel: Captain's Blood)

the planet Romulus
cities and settlements	Avra Trel • Bareldak Trel • Calanista • Caranam • Ch'eren • Chaladra • Dinalla • Dorvek • D'Sivas • East Umrika • Gavros Trel • Hlarek • Ihhlaie • I'Ramnau • Kanassarum • Kar'Mael • Ki Baratan (Government Quarter) • Kromtal Trel • Leinarrh • M'Narth • Portora • Rateg • Ra'tleihfi • Rhehiv'je • Tal K'shir • Tephren • Torven • Vela'Setora • Villera'trel
landmarks and institutions	Aekhhwi'rhoi • Arena of Life • Astrophysical Academy • Avenue of Processions • Boulevard of Heroes • Citadel Var'Theldun • Colleges of the Great Art • Hall of Columns • Hall of State • Imperial Academy of Arts • Imperial Palace • Square of Heroes • Plaza of the Endless Sky • Victory Square • Vikr'l Prison
nations and provinces	Elheu District • Kihai * Tikal
geography	Allerash Mountains • Ar'hael Desert • Beld'Rath Peninsula • Cave of Winds • Firefalls of Gal'Gathong • H'aareld va Groth'Chok • Hallows • Jeweled Forest of Ath'reshaar • Kae'raktar Mountains • Kor Thon • Landrosh Mountains • Plains of Aihai • Raas'trek Mountains • Sen'lanark Mountains • T'aresh Mountains • Valley of Chula • Valley of Fire • Wall of Fire Mountains
continents and landmasses	Brel'Kar • Dektenb • Ehrie'fvil • Masfarik • Novok • Umrika • Sath'har Archipelago • Uulma Islands • Umrika • Valkarja
bodies of water	Apnex Sea • Balsanra River • Bareldak Bay • D'Gansar River • Dorvek River • Garenah Sea • Gend'eroth River • Haverelar Sea • H'relgath River • Jendraax Strait • Sea of Lerodan • Nelrek Ocean • North Mendlanar Sea • Sherdak Sea • South Mendlanar Sea • Tai'eld River • Terelex Straits • Thal'Tharin River • Tor'ren River • Sea of Vrekess • White Sea