The heart-shaped lake in the Ezine district of northwest Turkey has turned pink this July [1], [2].

This natural phenomenon highlights the immediate impact of seasonal temperature shifts on local aquatic ecosystems. The vivid color change draws attention to the delicate balance of salinity and heat required to trigger specific biological responses in the region's water bodies.

Known as Lago del Cuore or the Pink Lake, the body of water is located near the coast of the ancient city of Alexandria Troas [1], [2]. The shift in hue occurs when summer heat and increased salinity levels create an ideal environment for the proliferation of a specific microalga [1], [3]. These microorganisms produce pigments that tint the water a distinct shade of pink as they multiply during the warmest months of the year.

Local observers said the change occurred as summer temperatures rose this month [1], [2]. The process is a recurring biological event tied to the environmental conditions of the Ezine district. The lake's unique heart shape adds to the visual spectacle, making it a point of interest for those visiting the northwest coast of Turkey [2], [3].

Scientists said the coloring is due to the symbiotic relationship between the water's chemical composition and the microalgae. When water evaporates during the heat of July, the concentration of salt increases, a catalyst that allows the algae to thrive and change the water's appearance [1], [3].

“The heart-shaped lake in the Ezine district of northwest Turkey has turned pink this July.”

The pink coloration of the lake is a biological indicator of high salinity and elevated water temperatures. While visually striking, this phenomenon reflects how specific climatic triggers can rapidly alter the microbial composition of a body of water, illustrating the sensitivity of these ecosystems to seasonal heatwaves.