Question: What river bounds the downtown area where WRKA studios are located?

full_context: Document 1: Downtown Oklahoma City: Downtown Oklahoma City is located at the geographic center of the Oklahoma City metropolitan area and contains the principal, central business district of the region. The CBD has over 51,000 workers and over 12000000 sqft of leasable office space to-date. Downtown Oklahoma City is the legal, financial, economic, nightlife, and entertainment center of the region.
Document 2: Madison, Indiana: Madison is a city in and the county seat of Jefferson County, Indiana, United States, along the Ohio River. Its estimated population was 12,247 as of 2016. Over 55,000 people live within 15 miles of downtown Madison. Madison is the largest city along the Ohio River between Louisville, Kentucky and Cincinnati, Ohio. Madison is one of the core cities of the Louisville-Elizabethtown-Madison metroplex, an area with a population of approximately 1.5 million. In 2006, the majority of Madison's downtown area was designated the largest contiguous National Historic Landmark in the United States—133 blocks of the downtown area is known as the Madison Historic Landmark District.
Document 3: WoodSongs Old-Time Radio Hour: The WoodSongs Old-Time Radio Hour was created, is produced, and is hosted by folksinger Michael Johnathon. The WoodSongs Old-Time Radio Hour is an all volunteer run non-profit organization, and is a worldwide multimedia celebration of grassroots music filmed in front of a live audience. WoodSongs is not a concert, but a one-hour musical conversation focusing on the artists and their music. The WoodSongs Old-Time Radio Hour began in 1998 in a small studio that sat only 20 people. It was recorded on a cassette tape that had to be turned over half way through the broadcast, and was picked up by one radio station, WRVG in Georgetown, Kentucky. In 1999 WoodSongs moved to a 150 seat room at the Lexington Public Library. After selling out 50 shows in a row, the broadcast was moved in 2000 to the Kentucky Theatre where it stayed until January 2013 when it moved to the 540 seat Lyric Theatre & Cultural Arts Center. By 2005 WoodSongs was being aired on 320 radio stations, and by 2013 509 radio stations across North America and Internationally. The radio program is available to both noncommercial and commercial radio stations, one of the few widely distributed radio programs in the United States to be offered to both types of stations. This does not include the addition of the American Forces Network which broadcasts it in 173 nations, to over 1 million listeners worldwide, and every US Naval ship at sea. In Kentucky, KET (Kentucky Educational Television) (PBS) public television airs the show several times a week. It is distributed to public television stations by the National Educational Telecommunications Association. The WoodSongs Old-Time Radio Hour produces 1 show a week for 44 weeks every Monday evening at the Lyric Theatre in Lexington, Kentucky, and has produced over 750 broadcasts that have aired worldwide.
Document 4: Louisville, Kentucky: Louisville ( , or ) is the largest city in the Commonwealth of Kentucky and the 29th-most populous city in the United States. It is one of two cities in Kentucky designated as first-class, the other being the state's second-largest city of Lexington. Louisville is the historical seat and, since 2003, the nominal seat of Jefferson County.
Document 5: Downtown Las Vegas: Downtown Las Vegas (commonly abbreviated as DTLV) is the central business district and historic center of Las Vegas, Nevada. It is the original townsite and was the gambling district of Las Vegas prior to the Strip, and the area still incorporates downtown gaming. As the urban core of the Las Vegas Valley, it features a variety of hotel and business highrises, cultural centers, historical buildings and government institutions, as well as residential and retail developments. Downtown is located in the center of the Las Vegas Valley and just north of the Las Vegas Strip, centered on Fremont Street, the Fremont Street Experience and Fremont East. The city defines the area as bounded by I-15 on the west, Washington Avenue on the north, Maryland Parkway on the east and Sahara Avenue on the south.
Document 6: Downtown Louisville: 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.
Document 7: Downtown Kansas City: Downtown Kansas City is the central business district (CBD) of Kansas City, Missouri and the Kansas City metropolitan area. It is between the Missouri River in the north, to 31st Street in the south; and from the Kansas–Missouri state line east to Bruce R. Watkins Drive as defined by the Downtown Council of Kansas City; the 2010 Greater Downtown Area Plan formulated by the City of Kansas City defines the Greater Downtown Area to be the city limits of North Kansas City and Missouri to the north, the Kansas–Missouri state line to the west, 31st Street to the south and Woodland Avenue to the east. However, the definition used by the Downtown Council is the most commonly accepted.
Document 8: Downtown Indianapolis: Downtown Indianapolis refers to the central business district of Indianapolis, Indiana, United States. The boundaries of downtown Indianapolis have varied over time as the city has grown. The city's original platted area, the Mile Square, (bounded by North, South, East, and West streets) is sometimes used to denote the downtown area. However, the Indianapolis Regional Center Plan, which is the official plan for Downtown Indianapolis, defines the boundaries to be 16th Street on the north, Interstate 65/70 on the east, Interstate 70 on the south and the Belt Railroad on the west. The Regional Center therefore encompasses not only the Mile Square, but also the Indiana University – Purdue University Indianapolis campus, White River State Park, and the Eli Lilly and Company corporate headquarters.
Document 9: WSTO: WSTO (96.1 FM, "Hot 96") is a heritage Top-40 radio station that serves the Evansville, Indiana, Owensboro, Kentucky, and Henderson, Kentucky markets. It is licensed to Owensboro and broadcasts from a 1,000-foot tower strategically located midway between these cities in the Kentucky town of Hebbardsville. WSTO's studio is located inside South Central Communications' headquarters on Mount Auburn Road in Evansville, Indiana, near the studios of WFIE-TV.
Document 10: WRKA: WRKA (103.9 FM, "The Hawk") is a radio station broadcasting a classic-based country music format. Licensed to Louisville, Kentucky, United States, the station serves the greater Louisville area. The station is currently owned by Summit Media LLC. The station's studios are located at Chestnut Centre in Downtown Louisville and the transmitter site, also located downtown, is atop National City Tower.
Document 11: WRZK: WRZK (95.9 FM, "95.9 The Hog") is a radio station broadcasting an active rock format. Licensed to Colonial Heights, Tennessee, USA, it serves the Tri-Cities TN / VA area. The station is owned by Glenwood Communications Corporation, through subsidiary Holston Valley Broadcasting Corporation.
Document 12: WDRB: WDRB, virtual channel 41 (UHF digital channel 49), is a Fox-affiliated television station licensed to Louisville, Kentucky, United States. The station is owned by Block Communications, as part of a duopoly with Salem, Indiana-licensed MyNetworkTV affiliate WMYO (channel 58); Block also operates Campbellsville-licensed CW affiliate WBKI-TV (channel 34) under a local marketing agreement with owner LM Communications, LLC. The three stations share studios located on West Muhammad Ali Boulevard (near Route 150) in downtown Louisville; WDRB and WMYO share transmitting facilities in rural northeastern Floyd County, Indiana (northeast of Floyds Knobs). On cable, WDRB is available on Charter Spectrum channel 9 and in high definition on digital channel 910.
Document 13: WBKI-TV: WBKI-TV, virtual channel 34 (UHF digital channel 19), is a CW-affiliated television station serving Louisville, Kentucky, United States that is licensed to Campbellsville. The station is owned by LM Communications, LLC; Block Communications, which owns Louisville-licensed Fox affiliate WDRB (channel 41) and Salem, Indiana-licensed MyNetworkTV affiliate WMYO (channel 58), operates WBKI under a local marketing agreement. WBKI maintains transmitter facilities located in Raywick. In 2014, all of WBKI's operations were consolidated at WDRB and WMYO's shared studio facility on West Muhammad Ali Boulevard (near Route 150) in downtown Louisville. Previously, WBKI maintained separate studios at the Kaden Tower on Dutchmans Lane in Louisville's Bowman section (along I-264/US 60/Henry Watterson Expressway), while the WDRB/WMYO facilities only housed WBKI's master control and some internal operations.
Document 14: WVKB: WVKB (101.5 FM) is a radio station broadcasting an adult contemporary format. Licensed to Hodgenville, Kentucky, USA, the station is currently owned by Elizabethtown CBC, Inc. and features programming from ESPN Radio.
Document 15: WJRS: WJRS (104.9 FM) is a radio station broadcasting a Country music format that is licensed to Jamestown, Kentucky, and serving the Jamestown/Russell Springs area in Russell County, Kentucky. The station is currently owned by Lake Cumberland Broadcasters, LLC, which also owns WJKY. The two stations share broadcast facilities and transmitting tower at 2804 South US 127 on the south side of Russell Springs.
ground_truth: Ohio River