Areas B18, B19 and B20 are drawn as being 'lower' than the rest of the second level dungeon. Making it effectively 2 stairways down from ground level.
The presence of boats and a pully system suggests that it's possible to travel by boat from the cave into the swamp. Suggesting that the cave is at a similar height as the ground level.
But I don't see how this could possibly work. The only explanation I have is that the staircases may be drawn incorrectly and the cave is actually higher than the rest of dungeon B?
How are people interpreting this?