Nelkar is a Class M planet located in Sector 221-G. It is the homeworld of the Nelkarites, with its capital city is Selinium. Following the collapse of Thallonian Empire, a number of refugees settled on Nelkar. (NF novels: The Two-Front War, End Game)

Doctor Meron Byxthar, a sociological expert, observed the life of the Thallonians on Nelkar as part of her work. (TNG novel: Losing the Peace)

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Sector 221-G
AhmistaAloraAlpha Carinae/Canopus/Suhail (Canopus PlanetAlpha Carinae IIAlpha Carinae IIIAlpha Carinae IVAlpha Carinae V) • Boragi system (Boragi III) • Mandylor system (Mandylor V) • NelkarNew ThallonPriatiaQandisRespler system (Respler IV-A) • Thallon system (Thallon)
planets visited by ships named Excalibur
USS Excalibur (2240s) Donatu V
USS Excalibur (NCC-1664) Velarrh VIILinyar IIAltair VINeural IIIPriatiaArgelius II
USS Excalibur (NCC-26517) Vigan Delta VLintar IVArgelius IINelkarThallonZondarAhmistaHareshEnevNarobi IIFennar
USS Excalibur (NCC-26517-A) Priatia
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