It's jography

[owl]

I was reading Thuggery Affair for the third time this week (and managed to put a giant crease in the cover when I was carrying it in my bag, boo). Anyway, the thing is, when Lawrie and the boys are walking home after the canoe sinks, it says that the Thuggery don't often cross the river, so they aren't seen in Westbridge much. But Patrick can go from his house to Monk's Culvery under cover; so does the Tunnel of the Moated Pile go under the river then? It seems a little ambitious.

ETA: What about the rest of you? What way do you imagine Westbridge and its surroundings—do you have a mental map like ankaret and I do, or do you never think about it?
And is it possible to draw a map, or are there too many contradictions?