Sector 21803 was an area of space, a sector located somewhere in the galaxy's Alpha or Beta Quadrants, in proximity to the Federation's border with the Klingon Empire in the late 23rd century.

In the year 2293, the starship USS Kongo was proposed to take part in the Operation Retrieve plan from a start point in sector 21803. The Kongo's location was noted on a chart listing the locations of planned Starfleet ship locations in a range of sectors from sector 21166 to sector 23094. (TOS movie: The Undiscovered Country)

The Operation Retrieve info was a series of charts created as set dressing by the production artists and decorators, and as such was not all distinctly visible on screen.

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sectors of the galaxy
sector blocks and their major sectors	Alpha Centauri (Teneebia • Sierra • Vendor) • Alpha Trianguli (Algira • Almatha • Dorvan) • Beta Ursae (Bajor • Cardassia • Kalandra) • Eta Eridani (Aldebaran • Archanis • Donatu) • Gamma Orionis • Iota Pavonis • Omega Leonis‎ • Orellius • Pi Canis • Psi Velorum • Regulus • Sirius‎ • Tau Dewa‎ • Tekara • Vyntadi • Zeta Andromedae (Arawath • Kora • Orias • Vanden) Alpha Quadrant sector block • Beta Quadrant sector block • Delta Quadrant sector block • Gamma Quadrant sector block
other named sectors	Ajman • Akiganel • Aldebaran • Allicar • Alpha 19 • Alpha Centauri • Alsuran • Anchar • Andor • Ansterra • Antares • Antedian • Archimedes • Arawath • Argosian • Argus • Arias • Bellatrix • Beloti • Benecia • Beta Niobe • BeTau • B'Moth • Bolarus • Boswellia • Cabral • Camborn • Campan • Canopis • Carraya • Celes • Cestus • Cicada • Dalmine • Dasha • Delta 300 • Delta 330 • Delta Vega • Denobulan • Devron • Eerina V • Elias • Epsilon IX • Epsilon Quinonez • Epsilon Z-3 • Epsilon-485 • Foxtrot • Fries-Posnikoff • G-5 • G17 • Galloway • Gamera • Gamma Hydra • Gamma Trianguli • Gand • Gariman • Gavaria • Glessene • Glintara • Gourami • Grewler • Gurava • H-100 • Hekaras • Horus • Hromi • Hyralan • Igo • Jaradan • Kaleb • Kandari • Kavis Alpha • Kavrot • Lagana • Lan'Tuana • Leughon • Lidara • Magellan • Malfabrican • Markomen • Markonia • Mariotian • Marrab • Maxia • Mekorda • Minara • Moab • Mobia • Moran • Murasaki • Omega • Omical • Oneamisu • Ophiucus • Parvenium • Perseus • Podaris • Procyon • Qav'loS • Quebec • Rakhari • Red • Regulus • Reydovan • Rhomboid Dronegar 006 • Rhymus Major • Romeo • Rukani • Rutharian • Samnar • Sargasso • Scylla • Selay • Selcundi Drema • Sigma Draconis • Sigma-485 • Sikarian • Silarian • Sol • Takara • Talar • Tango • Tarod • Taugan • Tellar • Terra Nova • Thanatos • Tharkian • Theta • Tiber • Tintagel • Trexelian 001 • Trexelian 002 • Trexelian 003 • Trexelian 004 • Trexelian 005 • Trexelian 006 • Trexelian 007 • Trexelian 008 • Trexelian 009 • Trexelian 010 • Trexelian 011 • Triangle • Trianguli • Trill • Twilight Nebula • Typhon • Umani • Vanden • Vaskan • Vega • Vega 6 • Vega-Omicron • Venturius • Vesta • Vrung • Vulcan • V'varian • Windu • Woden • Wumpar • Xarantine • Yontasa • Yurok • Zed Lapis • Zhirr • Z-6 • Zytchin
numbered sectors	001 • 002 • 003 • 004 • 005 • 006 • 007 • 008 • 009 • 010 • 12-J • 14C • 16C • 018 • 18J • 019 • 21C • 023 • 23-D • 23-H • 024 • 27F • 028 • 29G • 030 • 031 • 032 • 034 • 038 • 038G • 39J • 040 • 047B • 054 • 054R • 061 • 063 • 068H • 078 • 079F • 90.4 • 097 • 108 • 109G • 116T • 119D • 130 • 134 • 142 • 145 • 179 • 204E • 213 • 219A • 220B • 220A • 221-G • 221-H • 262 • 275 • 283 • 396 • 401 • 418D • 441 • 4-70 • 492 • 500 • 507 • 743-D • 861 • 875 • 902 • 949 • 1045 • 1156 • 1385 • 1509 • 1607 • 1608 • 1609 • 2158 • 2520 • 3556 • 3641 • 3658 • 4423 • 19658 • 21166 • 21185 • 21290 • 21305 • 21396 • 21399 • 21459 • 21503 • 21505 • 21527 • 21538 • 21602 • 21803 • 21834 • 21835 • 21947 • 22036 • 22055 • 22093 • 22139 • 22309 • 22358 • 22402 • 25712 • 22757 • 22846 • 22849 • 22853 • 22858 • 22956 • 23079 • 23094 • 25013 • 36764 • 37628 • 41751 • 41752 • 41753 • 64238