It's in one (or more, but usually one) of the 0x29 fragments. You have to take the player's position, walk the BSP tree to the right node, and then cross-reference that with the 0x29 fragments to see if the node is included in the list. Of course, you can do the cross-reference in advance for all tree nodes, but you have to watch for the fact that different 0x29 fragments can point to different things (water, lava, PvP, teleporters, zone lines, etc). There are also two different ways of encoding water areas (an "old way" and a "new way")
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