[PAR] [TLE] Downtown Louisville [SEP] Downtown Louisville is the largest central business district in the Commonwealth of Kentucky and the urban hub of the Louisville, Kentucky Metropolitan Area.  Its boundaries are the Ohio River to the north, Hancock Street to the east, York and Jacob Streets to the south, and 9th Street to the west.  As of 2000, the population of Downtown Louisville was 2,575. [PAR] [TLE] Ohio River [SEP] The Ohio River, which streams westward from Pittsburgh, Pennsylvania, to Cairo, Illinois, is the largest tributary, by volume, of the Mississippi River in the United States.  At the confluence, the Ohio is considerably bigger than the Mississippi (Ohio at Cairo: 281,500 cu ft/s (7,960 m/s); Mississippi at Thebes: 208,200 cu ft/s (5,897 m/s)) and, thus, is hydrologically the main stream of the whole river system.
[PAR] [TLE] Downtown Louisville [ SEP ] Downtown Louisville is the largest central business district in the Commonwealth of Kentucky and the urban hub of the Louisville , Kentucky Metropolitan Area . Its boundaries are the Ohio River to the north , Hancock Street to the east , York and Jacob Streets to the south , and 9th Street to the west . As of 2000 , the population of Downtown Louisville was 2,575 . [PAR] [TLE] Ohio River [ SEP ] The Ohio River , which streams westward from Pittsburgh , Pennsylvania , to Cairo , Illinois , is the largest tributary , by volume , of the Mississippi River in the United States . At the confluence , the Ohio is considerably bigger than the Mississippi ( Ohio at Cairo : 281,500 cu ft / s ( 7,960 m / s ) ; Mississippi at Thebes : 208,200 cu ft / s ( 5,897 m / s ) ) and , thus , is hydrologically the main stream of the whole river system .
Which river that streams westward from Pittsburgh, Pennsylvania, to Cairo, Illinois is the northern boundary of Downtown Louisville?
Which river that streams westward from Pittsburgh , Pennsylvania , to Cairo , Illinois is the northern boundary of Downtown Louisville ?
Ohio River
Ohio River