Question: What river flows through the city Paycom's headquarters are located?

full_context: Document 1: Paycom: Paycom Software, Inc., known simply as Paycom, is an American online payroll and human resource technology provider based in Oklahoma City, Oklahoma. It is attributed with being one of the first fully online payroll providers and has offices throughout the U.S. It has also been recognized by Fortune magazine as one of the fastest-growing publicly traded companies in the world and Forbes' magazine ranked it one of the top five fastest-growing publicly traded technology companies in its Fast Tech rankings. Founded in 1998, it reported annual revenue of $566.3 million for 2018, up from $433 million for 2017.
Document 2: PayPal: In 2013, PayPal acquired IronPearl, a Palo Alto startup offering engagement software, and Braintree, a Chicago-based payment gateway, to further product development and mobile services. In June 2014 David Marcus announced he was leaving his role as PayPal President; Marcus joined PayPal in August 2011 after its acquisition of Zong, of which he was the founder and CEO. David Marcus succeeded Scott Thompson as president, who left the role to join Yahoo. PayPal announced that Marcus would be succeeded by Dan Schulman, who previously served as CEO of Virgin Mobile and Executive vice president of American Express.
Document 3: Oklahoma City: The city is roughly bisected by the North Canadian River (recently renamed the Oklahoma River inside city limits). The North Canadian once had sufficient flow to flood every year, wreaking destruction on surrounding areas, including the central business district and the original Oklahoma City Zoo. In the 1940s, a dam was built on the river to manage the flood control and reduced its level. In the 1990s, as part of the citywide revitalization project known as MAPS, the city built a series of low-water dams, returning water to the portion of the river flowing near downtown. The city has three large lakes: Lake Hefner and Lake Overholser, in the northwestern quarter of the city; and the largest, Lake Stanley Draper, in the sparsely populated far southeast portion of the city.
Document 4: Oklahoma City: Oklahoma City has a major park in each quadrant of the city, going back to the first parks masterplan. Will Rogers Park, Lincoln Park, Trosper Park, and Woodson Park were once connected by the Grand Boulevard loop, some sections of which no longer exist. Martin Park Nature Center is a natural habitat in far northwest Oklahoma City. Will Rogers Park is home to the Lycan Conservatory, the Rose Garden, and Butterfly Garden, all built in the WPA era. Oklahoma City is home to the American Banjo Museum, which houses a large collection of highly decorated banjos from the early 20th century and exhibits on the history of the banjo and its place in American history. Concerts and lectures are also held there.
Document 5: Lake Texcoco: Tenochtitlan was founded on an islet in the western part of the lake in the year 1325. Around it, the Aztecs created a large artificial island using a system similar to the creation of chinampas. To overcome the problems of drinking water, the Aztecs built a system of dams to separate the salty waters of the lake from the rain water of the effluents. It also permitted them to control the level of the lake. The city also had an inner system of channels that helped to control the water.
Document 6: JPay: JPay is a privately held corrections-related service provider based in the United States with its headquarters in Miramar, Florida. The company contracts with state Departments of Correction (DOC), county jails, and private federal prisons to provide technologies and services including money transfer, email, video visitation and parole and probation payments to approximately 1.5 million inmates throughout 35 states.
Document 7: PNC Financial Services: The PNC Financial Services Group, Inc. Type Public Traded as NYSE: PNC S&P 500 Component Industry Financial services Predecessor Pittsburgh National Corporation Provident National Corporation Founded April 10, 1845; 172 years ago (1845 - 04 - 10) Operational: January 28, 1852 Headquarters Tower at PNC Plaza Pittsburgh, Pennsylvania, United States Number of locations 2,520 branches Key people William S. Demchak (CEO) Robert Q. Reilly (CFO) Revenue US $16.423 billion (2016) Net income US $3.903 billion (2016) Total assets US $366.38 billion (2016) Total equity US $45.699 billion (2016) Number of employees 49,360 (2016) Website PNC.com
Document 8: Mexico City: Originally much of the valley laid beneath the waters of Lake Texcoco, a system of interconnected salt and freshwater lakes. The Aztecs built dikes to separate the fresh water used to raise crops in chinampas and to prevent recurrent floods. These dikes were destroyed during the siege of Tenochtitlan, and during colonial times the Spanish regularly drained the lake to prevent floods. Only a small section of the original lake remains, located outside the Federal District, in the municipality of Atenco, State of Mexico.
Document 9: Oklahoma City: Walking trails line Lake Hefner and Lake Overholser in the northwest part of the city and downtown at the canal and the Oklahoma River. The majority of the east shore area is taken up by parks and trails, including a new leashless dog park and the postwar-era Stars and Stripes Park. Lake Stanley Draper is the city's largest and most remote lake.
Document 10: Seattle: Still, very large companies dominate the business landscape. Four companies on the 2013 Fortune 500 list of the United States' largest companies, based on total revenue, are headquartered in Seattle: Internet retailer Amazon.com (#49), coffee chain Starbucks (#208), department store Nordstrom (#227), and freight forwarder Expeditors International of Washington (#428). Other Fortune 500 companies popularly associated with Seattle are based in nearby Puget Sound cities. Warehouse club chain Costco (#22), the largest retail company in Washington, is based in Issaquah. Microsoft (#35) is located in Redmond. Weyerhaeuser, the forest products company (#363), is based in Federal Way. Finally, Bellevue is home to truck manufacturer Paccar (#168). Other major companies in the area include Nintendo of America in Redmond, T-Mobile US in Bellevue, Expedia Inc. in Bellevue and Providence Health & Services — the state's largest health care system and fifth largest employer — in Renton. The city has a reputation for heavy coffee consumption; coffee companies founded or based in Seattle include Starbucks, Seattle's Best Coffee, and Tully's. There are also many successful independent artisanal espresso roasters and cafés.
Document 11: Dammam: Having been built from the ground up, the Dammam Area was designed from the outset on the principles of modern urban planning. Residential areas are separate from commercial sections, roads are broad and straight and buildings conform to a master plan. One of the main features of the development of the area is land reclamation. Vast stretches of the shallow Persian Gulf waters have been filled, with hotels and office buildings occupying what were once marshes. Water for household, urban and industrial use is provided by desalination plants that supply approximately seven million cubic feet of treated water to the area each day. The availability of water underpins the urban and industrial growth of the Dammam Area, and provisions have been made for expanding existing desalination facilities to meet future growth.
Document 12: Oklahoma City: In 1993, the city passed a massive redevelopment package known as the Metropolitan Area Projects (MAPS), intended to rebuild the city's core with civic projects to establish more activities and life to downtown. The city added a new baseball park; central library; renovations to the civic center, convention center and fairgrounds; and a water canal in the Bricktown entertainment district. Water taxis transport passengers within the district, adding color and activity along the canal. MAPS has become one of the most successful public-private partnerships undertaken in the U.S., exceeding $3 billion in private investment as of 2010. As a result of MAPS, the population living in downtown housing has exponentially increased, together with demand for additional residential and retail amenities, such as grocery, services, and shops.
Document 13: WePay: WePay was founded by Rich Aberman and Bill Clerico in 2008 in Boston, Massachusetts, and is now headquartered in Redwood City, California. The original inspiration for WePay occurred to Aberman when he had difficulty raising money for his brother's bachelor party. Aberman had to collect $4,200 from 14 friends spread across the United States to pay for bottle service at a club, rent at a Florida beach house, and food. Through a series of cash, checks, and PayPal money transfers, Aberman was eventually able to collect the money he needed. Aberman found the process very burdensome and believed that there should be an easier way to collect money from people. After studying PayPal's weaknesses, Aberman asked Clerico to help him to solve this problem and create WePay.
Document 14: Palermo: Today both the Papireto river and the Kemonia are covered up by buildings. However, the shape of the former watercourses can still be recognised today, because the streets that were built on them follow their shapes. Today the only waterway not drained yet is the Oreto river that divides the downtown of the city from the western uptown and the industrial districts. In the basins there were, though, many seasonal torrents that helped formed swampy plains, reclaimed during history; a good example of which can be found in the borough of Mondello.
Document 15: Oklahoma City: In 2008, Forbes magazine named Oklahoma City the most "recession proof city in America". The magazine reported that the city had falling unemployment, one of the strongest housing markets in the country and solid growth in energy, agriculture and manufacturing. However, during the early 1980s, Oklahoma City had one of the worst job and housing markets due to the bankruptcy of Penn Square Bank in 1982 and then the post-1985 crash in oil prices.[citation needed]
ground_truth: North Canadian River
sub_queries: Paycom >> headquarters location Answer: Oklahoma City
What river flows through Oklahoma City ? Answer: North Canadian River