Lets say we want this long vertical cliff gone
![Image](https://forums.factorio.com/images/ext/61d65d4d4c72ff72e27e537900285d87.jpg)
Mark it with a BP of, say, concrete
![Image](https://forums.factorio.com/images/ext/d8e36f8f63e6c42b288e3aa1688982a4.jpg)
And throw 1 Cliff explosives. As you can see the entire thing disappeared, and there`s only 1 crater.
![Image](https://forums.factorio.com/images/ext/a6a4baadeff4ce6a35b128f69c861127.jpg)
Im not sure if this works with anything other then concrete but I would assume so. (EDIT: Nope, only tiles seems to work)