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Alex recently added the cave wall icons ("grotto"), which is essentially for this map, which mixes dungeon and cave walls. However, Gridmapper doesn't allow for water in the same square, or for partial water squares, hence the blockiness of the water areas.
I added the thaumaturgist's tower, which is described in the text but not shown on the map.
Where icons were available, I've also added some notable features for various rooms; for fun I'll let you figure them out for yourself.
(Just noticed I left the compass direction off the map)