A theater of ice
The Gavarnie Cirque is a massive natural amphitheater in the Pyrenees mountains, formed by repeated glacial erosion over millions of years. Its near-vertical limestone walls rise up to 1,500 meters (4,900 feet) from the cirque floor to the surrounding peaks, which exceed 3,000 meters in elevation. The structure is immense, measuring about 3,000 meters (9,800 feet) wide at the top and 800 meters wide at its deepest point. The entire circumference of the upper rim spans approximately 6.5 kilometers. This landscape is a direct result of Quaternary glaciers that once grew up to 400 meters deep and extended 40 kilometers to the location of modern-day Lourdes.
The process that formed the cirque is an example of glacial quarrying and abrasion. A mountain glacier, originating in a small depression, plucks rocks from the back wall and grinds the base through the movement of embedded debris. Over successive ice ages, this action carves out a deep, bowl-shaped basin with steep headwalls. The peaks framing the cirque, such as Pic du Marboré (3,248m) and Taillon (3,144m), mark the upper limits of this glacial sculpting. The site, along with the surrounding Pyrénées-Mont Perdu area, was inscribed as a UNESCO World Heritage site in 1997 for its exceptional geological and cultural value.