Spectacular images of what appears to be a stream of lava tumbling down a cliff have emerged from one of the world's most beautiful nature reserves.
Every February, spectators can observe a stunning natural phenomenon known as a "firefall" at Yosemite National Park in the United States.
The firefall can
occur at sundown for a few weeks every February, park authorities said.
"The Horsetail Fall phenomenon appears when the angle of the setting sun sets the waterfall ablaze with reds and oranges, like a fire was falling down the cliffs on the shoulder of El Capitan," according to the Yosemite National Park website.
"In late February, you'll often see rows of photographers of all levels there catching the last rays of light in the evening ... The phenomenon is typically the most stunning during middle to late February. However, the effect depends on conditions for the year, and photographers may be luckier before or after that time frame depending on the amount of water flow in Horsetail Fall, and the cloud cover."
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