Where is the Berne River?

Question

It is only three letters long

Answer 1

i concur with the other respondants. The river you speak of is the Aare River.
and it has four letters.

but you could spell it with just one.

Answer 2

Do you mean the Aare River in Berne?

Answer 3

if you mean the river going through the city of bern, then it's the Aare. otherwise i have no idea what river you're talking about, sorry!