Given the task definition and input, reply with output. Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : The Cobblers' Bridge or the Shoemakers' Bridge (Slovene: Cevljarski most or Sustarski most) is a bridge crossing the river Ljubljanica in Ljubljana, the capital of Slovenia.
Answer : Ljubljanica
Over which river does Cobblers' Bridge cross?