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Map showing the Mara River Basin, Kenya, and its relationship to the Maasai Mara National Reserve (MMNR) and Serengeti National Park (SNP) (A), the distribution of wildebeest crossing sites along the Mara River coded by the number of mass drownings confirmed to have occurred at each site (for 21 of the 23 drownings) (B), and the distribution of 3,380 wildebeest carcasses over 5 km of river after a mass drowning in July 2011 at the crossing site coded red in B (C).
