Sector 25013 was a region of space within the Cardassian Union.
History and specifics
During the Dominion War, it was the location of a Dominion monitoring outpost. On stardate 52646.1, the Starfleet vessels USS Fredrickson, USS Musashi, and USS Sentinel were assigned to sector 25013 to take out this outpost, as part of an effort to destroy the shipyards at Orias III. Both the Fredrickson and Musashi were destroyed by Dominion forces in this effort. (SCE eBook: War Stories, Book 1)