A monticule is a small hill. Sounds rather friendly, doesn't it? The sort of place you'd walk up to enjoy a picnic involving ginger beer and home made cake. A monticule can also be a mini mound caused by a volcano.
Here's the view from a hill (quite a big one) I climbed up last summer. Recognise it?
Clue ... instead of climbing up, you could just swan about down the bottom.