Jartar is a terrestrial world with a trace atmosphere of krypton and xenon. The surface is hot, and mainly composed of unremarkable silicates. Occasional deposits of aluminum, magnesium, and other light metals can be found.
Jartar is noted for the discovery of the "Leviathan of Dis," the apparent corpse of a genetically engineered living starship. The Leviathan was found in the bottom of a crater by a batarian survey team, and estimated to be nearly a billion years old. It "disappeared" after a visit to the system by a batarian dreadnought twenty years ago.
Since then, the batarians have steadfastly denied that the Leviathan existed at all – and all the more vociferously when shown recordings of the corpse made by salarian researchers.