H'atoria was a Klingon Empire planet, near the Federation border. The world sustained a small Klingon colony population in the 24th century. H'atoria was mostly covered in water oceans, with very few landmasses, and had two small moons. H'atoria was home to a native amphibious civilization called the Selsseress.
In 2016 a Vulcan ship crossed in to Klingon territory near H'atoria, and was promptly destroyed by the Klingons. Afterwards the Vulcans responded by firing first whenever they encountered the Klingons. They continued this practice until formal relations were established. (DSC episode: "The Vulcan Hello")
In early 2381, it was one of the many worlds devastated by the Borg Invasion. Over seven thousand Borg cubes launched to the Alpha and Beta Quadrants from the Azure Nebula. While briefing Federation President Nanietta Bacco on their losses, Raisa Shostakova estimated that H'Atoria was likely to be attacked within four hours. The Borg assaulted H'atoria, leaving virtually nothing behind, only a few surviving Selsseress. About three months later, the abandoned world was conquered by the Kinshaya, as part of the new offensive against the Klingon Empire. (ST - Destiny novel: Mere Mortals)
|Pi Canis sector block|
|Hromi Cluster (Gamma Hromi, Gamma Hromi II)|
|Hromi sector||Gateway (Alpha Zeta, UFC 465537) system (Gateway) • JFS47 system • Kalferi system (Kalferi II) • Korvat system (Korvat) • Maiewski system (Maiewski Prime) • Veyga (Eta Veyga) system (Veyga IV)|
|Mempa sector||Beta Thoridor system (Beta Thoridor planet) • Ceron system • Da'Kel system (Da'Kel I • Da'Kel II, Gion • Da'Kel III) • Eriksson system • H'atoria system (H'atoria) • Lilitu system • Mempa system (Mempa II • Mempa IV • Mempa V • Mempa VII • Mempa VIII • Mempa IX) • M'rade system • Vesper system (Vesper II) • Vor system (Vor II)|
|Xarantine sector||Danteri system (Danter) • Honod system • Kern system (Kern III) • Laurentian system • Seedea system • Trimble system (Trimble) • Xarantine system (Xarantine VI)|