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World Largest Urban Centres By River Basin
DirectionsName the largest urban centre for each river basin it is classified as being in. Urban centres are defined by the European Commission at the link below. Occasionally an urban centre name isn’t a city name, but rather a country/district/area. River basin and population shown. FYI – river basins are often very large areas around a river, and the city may be a good distance away from the actual river.
https://ghsl.jrc.ec.europa.eu/ghs_stat_ucdb2015mt_r2019a.php
Quiz Takers 
I wish the river name stayed up, since I sometimes got an answer by accident and don’t know what the river is
The second Colorado River flows into the Gulf of Mexico, not the Caribbean.
the data specifies the Caribbean for some reason so leaving it as is