Columbia

District of, in U.S.,sosq.m.,on; R.Potomac surrounded by Virg.and Maryland; belongs to no State, but under immediate jurisdiction of Congre ; contains Washington, cap. of the Union, 229,796 also c. in U.S., Pennsylv. on Susquehanna R., 10,599;; also c. cap. of S. Carol., on Congaree R., 15,353; t- Tenn., 45 m. S.S.W. Nashville, 5370; also t. Mo., 4000; also c. N. pt. of Grant Land, Arctic America also r. flows from Rocky Mts. in Brit. Columbia, between; Oregon and Washington Terr., to Pacific (called also Oregon), 1400 m.