Usually they are the somewhat steep hills or with an opposing cliff, giant dick guy is viewable without being in the air today and this one probably is too.

Angled like so.

…org.uk/…/history-of-the-cerne-giant

Viewed like so.

independent.co.uk/…/cerne-abbas-giant-anglo-saxon…

Uffington white horse , it’s a bit figural and looks a lot like a river in certain angles.

www.uffington.net/…/white-horse-hill/