Corrections Policy

Report an error

If you spot a mistake in a guide, email us using the address on our Contact page. Include the article URL and the information that supports your correction, such as an official source, a screenshot or a document. That helps us check the point.

What happens next

We review confirmed factual errors and update the article. Where the change is meaningful, we add a short note explaining what was corrected. Article dates reflect actual content updates, so a corrected page may carry a new date. For more on how we write and research, see our Editorial Policy.

Search the journal

Image credits

Thomas Wolf , www.foto-tw.de

Image source · CC BY-SA 3.0 de

Photograph resized and cropped to 16:9; WebP thumbnail resized.

Daniel Kraft

Image source · CC BY-SA 3.0

Photograph resized and cropped to 16:9; WebP thumbnail resized.

NOTE: This image is a panorama consisting of multiple frames that were merged or stitched in software. As a result, this image necessarily underwent some form of digital manipulation. These manipulations may include blending, blurring, cloning, and color and perspective adjustments. As a result of these adjustments, the image content may be slightly different from reality at the points where multiple images were combined. This manipulation is often required due to lens, perspective, and parallax distortions.

Image source · CC BY-SA 4.0

Photograph resized and cropped to 16:9; WebP thumbnail resized.

FreeclimbZurich

Image source · CC BY-SA 4.0

Photograph resized and cropped to 16:9; WebP thumbnail resized.

FreeclimbZurich

Image source · CC BY-SA 4.0

Photograph resized and cropped to 16:9; WebP thumbnail resized.