Between the map and the plaques on the wall that give numbers for each surface shaft, Wren is able to surmise that their current location, surface shaft 72, is located in the Docks Ward, very close to the exit of the sewers into Deepwater Harbor. If they were to climb the ladder above their heads, they'd be in the Philosopher's Court, just east of Snail Street and north of the Street of Curtains.