Here's a tweet from Bill McKibben
Um, Bolivia's 2nd-largest lake altogether dried up in the last months. Because--you know https://t.co/diKynY8oxT pic.twitter.com/mkeTdmUwqB
— Bill McKibben (@billmckibben) January 13, 2016And here's an excerpt from Wikipedia about the same lake.
When the water level of Titicaca Lake drops below 3,810 m, the flow of Desaguadero River is so low it can no longer compensate for the massive water losses due to evaporation from the surface of Poopó Lake. At this point, the lake volume begins to decrease. At its maximum in 1986, the lake had an area of 3,500 km2. During the years that followed, the surface area steadily decreased until 1994 when the lake disappeared completely. The time period between 1975 and 1992 is the longest period in recent times with a continuous existence of a water body.
And here's a research paper too:
The lake seems from the records of Marin & Quitanilla (2002) to have been dry between 1939 and 1944, and nearly dry in 1970–1972.