Ca' the yowes to the knowes

 

There was a shepherd calling a sheepdog in Langdale which reminded me of Robert Burns' song. More to the point, there was a clearly discernible echo from Pike Howe crags. Map measurements suggest that direct sound came from 100m away (red arrow) and that the reflection travelled 150m there and 250m back. The difference is 300m of sound travel. That gives about a second which would be noticeable as an echo. I think it might have been less but it is hard to tell which part of the crag is reflecting the sound. The yowes ended up on the Howe in this case.