whats the book where a bunch of people are walking an extremely long distance

The most likely book is The Long Walk by Stephen King. It’s the famous novel about a group of boys forced to keep walking until only one remains.

Why that fits

• The title matches the idea almost exactly: a very long walk as the whole premise.

• It’s widely discussed as King’s early and especially disturbing novel.
• The story centers on a brutal endurance walk, which is probably what you’re remembering.

Other possible books

• A Walk in the Woods by Bill Bryson, if you meant a long hiking journey rather than a grim competition.
• Wild by Cheryl Strayed, if you meant a solo long-distance trek.
• The Pilgrimage by Paulo Coelho, if you meant a spiritual long walk.

Likely answer

If you mean the book where a bunch of people are literally walking an extreme distance in a harsh, high-stakes way, it’s almost certainly The Long Walk.