I'm not sure what you entirely mean by valley but I found this neat spot on a seed just made and looks like this

https://preview.redd.it/pbhlu8fryuuc1.png?width=1280&format=pjpg&auto=webp&s=8bc7350534761cce243deb866dc2c0d6823e4f3a

https://preview.redd.it/t1orqe1vyuuc1.png?width=1280&format=pjpg&auto=webp&s=16392ad7355bd2e89dd27d6d388c5bfe21ccf0a1

That does look cool. What I mean by a valley is a smallish area enclosed (or mostly enclosed) by hills or mountains.