Missing map percent in Slyphs Cave

[Tassimmo]

Hi everyone,
in Sylphs Cave there is one piece of the map I can't reach. In the final floor, there is a row of opened chests i can't pass. Behind them (south of said chests on the map) there is like one pixel of it I can't reach to fill out the map. Is there any way to get there? Having 99% on this single map sucks...
A screenshot of said situation is found HERE[imgur.com].

Thanks in advance!

[Blissful Winds]

That last portion is accessed through a hidden passage via the left end of the wall in the right segment of the floor. That small area below takes you to the hidden sylph cave stash, where you can get upgrades for equipment, but only if you are running from there to the Eidolon Cave before you hit the Sealed Cave. The cache has six chests -- ALL of them are monster-in-a-box.

[Tassimmo]

Oh, thank you very much!
As you've seen on my map I have been in this right part already, but was too dumb to find this secret passage. Because there was no other way out, I teleported myself out of the dungeon and forgot about it :D Now I've got the map and the six chests.