Have the major canals and islands that make up Doskvol been given names?* A local giving directions isn’t going to talk about the northern section of Barrowcleft, across the river; he’s going to describe a place o’er on Darvek island, right on the shore of the Lower Dosk. Naming/placing the minor streets and canals is up to the GMs, but the primary physical features would be well known to inhabitants.
*I’m guessing that Whitecrown is also the name of the island the district sits on. But I could be wrong.