Lake Poopó, once Bolivia’s second-largest lake, dried out at the end of 2015 after years of declining water levels. Lake Poopó is especially vulnerable to changes in its water supply because it is typically no more than three metres deep. Diversions Reduce the Desaguadero River’s FlowThe Desaguadero River carries water south from Lake Titicaca and serves as Lake Poopó’s main tributary. Torres-Batlló and Marti-Cardona proposed stronger regulation of water use, including storing water during the wet season for release during drier months. By 2021, however, the recovery remained partial and much of Lake Poopó was still a salt-covered expanse.