User blog comment:ChishioKunrin/Vale & Beacon's position/@comment-10380701-20141110005746

I think that we're underestimating the size of the "river". It may not be a river, it's straight out a friggin' sea running across the city of Vale.

So far, it's been consistent that there's a large body of water in front Beacon that has a view of Vale. According to that Ironwood/JNPR image. In the map, there's this tiny tip of water jutting in Beacon's border... so maybe from the show, this is the only angle we've seen.