Is it possible to "fill out" the entire map?

[westlake]

Maybe I'm just OCD, but I keep making myself swim around enough to illuminate every bit of every area I come across.  If I check the map and see that there's a dark corner in a certain chamber or tunnel a ways back, then damn it I go there and swim around until it's gone!  I don't know if it's even possible to explore every single inch of the map (i.e. the very top of the Veil), but it would be strangely satisfying if there was some kind of notification or reward for finally doing so, even a small one just to let you know "Yeah, you've been everywhere someone can possibly go in Aquaria... loser."

[Glamador]

Well I thought about atempting to cover at least MOST of the Veil by jumping at various angles from various points from the top of the sun temple...but I gave up, too tedious.

[Cesium]

There are also some rooms with obstructions, like vines, in a corner, so you can't see a bit on the edge.

[Mina]

I'm the same way, which why it took me almost 50hs to finish, (plus forgetting to pause when my daughter interrupted me!) The thing that I keep wondering is if I found all the dark spots that you can see on the mini-map when you are in sun form but not on the big map, even when you've been their. 

Alec and Derek, did you consider having those illuminate on the large map once you've been there?