On the shore of Senegal¡¯s Pink Lake, salt farmer Pape Sira Ba has raked in what he fears may be his last harvest.

Extreme floods contaminated the 3-square-km lake five months ago, turning its famous waters green and threatening thousands of people who depend on it for their livelihoods.

Officially known as Lake Retba, the lake¡¯s high salinity and rare microbiome long-fostered an algae that turned it a pinkish color, making it one of the West African country¡¯s most visited attractions and under consideration as a UNESCO World Heritage site.