That's what are the spectacular "firefights" of California

"It's nature in his glory." Dakota Snider, head of Yosemite Park in the United States, describes the rare phenomenon of the "waterfall of fire" that leaves visitors astonished by the California nature reserve.

This natural spectacle usually occurs in February, when the water of the horsetail cataracts takes on a shining tone that oscillates between yellow, orange and red, as if it were a liquid fire pbading through the rocks.

The optical effect occurs only at sunset, between the middle and the end of February, and if there is a series of particular climatic conditions.