Living in the northwest of Mexico, the Cucapa people have relied on fishing as a means of subsistence for generations, but in the last several decades, that practice has been curtailed by water scarcity and government restrictions. The Colorado River once met the Gulf of California near the village where Shaylih Muehlmann conducted ethnographic research, but now, as a result of a treaty, 90 percent of the water from the Colorado is diverted before it reaches Mexico. The remaining water is increasingly directed to the manufacturing industry in Tijuana and Mexicali. Since 1993, the Mexican government has denied the Cucapa people fishing rights on environmental grounds. While the Cucapa have continued to fish in the Gulf of California, federal inspectors and the Mexican military are pressuring them to stop. The government maintains that the Cucapa are not sufficiently indigenous to warrant preferred fishing rights. Like many indigenous people in Mexico, most Cucapa people no longer speak their indigenous language; they are highly integrated into nonindigenous social networks. Where the River Ends is a moving look at how the Cucapa people have experienced and responded to the diversion of the Colorado River and the Mexican state's attempts to regulate the environmental crisis that followed.