T'Klass's Pillar was a spire of ancient red rock on the planet Vulcan which was situated at Mount Seleya and was close to Surak's Peak.

In 2156, during the Earth-Romulan War, T'Pol met Minister Kuvak in order to determine why the Confederacy of Vulcan was not aiding the Coalition of Planets against the Romulan Star Empire. During the meeting, she met Administrator T'Pau who emerged from T'Klass's Pillar in order to explain her reasoning. (ENT novel: Beneath the Raptor's Wing)

the planet Vulcan
cities and settlements	AraKahr • Chi-Ree • Da'kum'Ulcha • Da-Leb • In-Yar • Ishaya • Isk'Kahr • Jaleyi • Jalsyi • Jia'anKahr • Keldeen • K'Lan-ne • Khir Ahl • Kir • Kren'than • Kwil'Inor • Le'Tenya • Naweeth City • Nekhie • Remsusala • Rh'Iahr • SanaiKahr • ShanaiKahr • ShariKahr • ShiGral • ShiKahr • SriKahr • SuraKahr • T'lingShar • T'Paal • Ta'Raan • Ta'Ralor • Ta'Regar • Ta'Riah • Ta'Vistar • Vulcana Regar • Vulcinis • Xen'tal • Zayus
landmarks and institutions	Ancients of Days • Diplomatic Institute • Fal-lan-tral • Fort Aba'kur • Hall of Ancient Thought • Hall of Debates • Hall of Voices • Kolinahru Monastery • Kul'Cha'Vir • Ku'Vel'Di • Kurat Temple Complex • M'dai sensor dish • Monastery of Ulann • The Oasis • Raal Provincial Hospital • Sarek School of Diplomacy and Ambassadorial Studies • Serenity Square • ShiKahr Academy • Shrine of S'vec • Shrine of T'Vet • Surak Memorial • T'ralor Preserve • T'Karath Sanctuary • T'sar Museum • Tav'Sal'Nava • Tinsha Monastery • Te'Rikh • Temple of Logic • Temple of T'Panit • Temple of Amonak • T'Klass's Pillar • V'Shull Institute • Va'ne'meLakht • Vulcan Academy of Archives • Vulcan Archives • Vulcan Institute of Defensive Arts • Vulcan Science Academy
nations and provinces	Enclave of the Faceless Ones • Gol • Khomi • Kel Province • Kir Province • Lyr T'aya • Raal • Shi'al • Tat'Sahr • Xental • Xial
geography	Al-Stakna Mountains • Caves of Kolinar • Caves of Kulvir • Cheleb-khor Desert • Go'an Desert • Fire Plains • Kurat Mountain Range • Liangorn Mountains • Llangon Mountains • Mount Kholinar • Mount P-Ta • Mount Tarhana • Mountains of Gol (Mount Seleya • Surak's Peak) • Nal'shin Valley • Na'Ree • Pelasht • Plains of Gol • Plateau of Tai-la • Shival Flats • Ta'Valsh • Te-Vikram caves • T'Kallaron caves • T'Raan • T'Regar • T'Riah • T'ralor Preserve • Valley of Everlasting • Vilton Flats • Vulcan's Forge (Gateway • Plain of Blood • Womb of Fire) • Vuldi Gorge
continents and landmasses	Han-shir • Na'Nam • Xir'tan
bodies of water	Great T'Kala Sea • Lake Yuron • Straits of Ha'zen • Thanar Sea • Voroth Sea