Anywhere you are, press W to find the World Map. Now Right-Click on it, and you'll get the entire Maple World. You can click on certain areas to show their maps:
Ludus Lake: Ludibrium, Omega Sector, Korean Folk Town.
El Nath Mts: El Nath, Orbis.
Victoria Island: Ellinia, Henesys, Perion (Sharenian), Kerning City, Florina Beach, Lith Harbor, Sleepywood.
Aqua Road: Aquarium.
Minar Forest: Leafre.
Mu Lung Garden: Mu Lung, Herb Town.
Maple Island: Southperry, Amherst, Mushroom Town.
There's also a mysterious patch of map that "lights up" like the other areas, but doesn't respond to clicks. When you hover over Orbis to see train/plane/boat routes, one path leads to this area... looks like a new area? Masteria all over again =P.