What is the answer to:

[anibery]

I have seas but no water, coasts with no sand, towns but no people, mountains no land.

[B00]

The moon?

[Postdog]

An Atlas or map maybe.

[starry eyes]

Globe, map......

[El Blobbo]

A quick web search reveals the answer to be a map. Just goes to show you shouldn't take children's riddles too seriously. A map no more has real coasts than it has real sand; it's just paper. (I was just about to say a list of plurals, which I think is a marginally better answer.)