Chartreuse Island is a minor location somewhere along Lake Lachrymose.
It can be seen mentioned in the index of A Lachrymose Atlas.
Chartreuse Island is, likely, an island in the middle of the lake.
Some fans theorize the island is Chartreuse Island (the island within Lake Lachrymose). However, this is unlikely due to the fact the island is known to be in the ocean, not Lake Lachrymose, and it seems to be difficult to find and relatively uncharted.
- "Chartreuse" is light green color, between green and yellow, named after the liqueur of the same name.