A Welsh 3000 is one of the hills in Wales over 3000 feet. They fall within three ranges, all sufficiently close to make it possible to reach all
15 summits within 24 hours, a challenge known as the Welsh 3000s challenge.
The length of this challenge (from first peak to last) is about 42km, but including the walk to and from any start point, this will total some 48km. Most people undertaking the challenge walk it, and many achieve it in much less than 24 hours. The record for the challenge (from first peak to last) stands at 4 hours 19 minutes, set by Colin Donnelly in 1988.
The walk is also known as "The 14 Peaks" as Castell y Gwynt, part of the Glyder range, is not always included.
There's also a sixteenth top over 3000 feet, Garnedd Uchaf, which is regarded as a "sub" rather than a separate summit in its own right but many people choose to make the small diversion to include it on their traverse.
The Snowdonia Society maintains a public database of persons visiting the 14 peaks in a single journey.