The Graal world consists of 13 main locations: MoD Town, Onnet Town, Snow Town, Delta Island, Castle, Graal City, York Town, Deadwood, Swamp Town, Destiny, Oasis, Balamb Island and Big City Caldera.
The main map in Graal consist's only of MoD Town, Onnet Town, Snow Town, Delta Island, Castle, Graal City, York Town, Deadwood, Swamp Town and Destiny. all of these except Snow Town can be accessed easily. In order to get to snow town you will need either a Lantern, Draisine or be married to someone who has one or both of these. In order to get to snow town with a Lantern you go to the location north east of Onnet town and buy the lantern if you haven't done so (Lantern cost 2000 gralats). Follow the winding path up until you reach the cave entrance, enter the cave and when you get to the weird door at the end use the lantern to destroy it. Getting there via Draisine is self explanatory just buy the draisine from the train station in Graal City jump on any track and it will eventually take you to snow town. Last but not least being married to someone who has access to Snow Town. This method is very impracticable because in order to do this your partner needs to be online, have your partner go to snow town and then summon you.
Oasis, Balamb Island and Big City Cladera (Big City) are only accessible by boat. Two boats can be found in the main map of Graal. the first being Delta island which takes you to Oasis and Big City and the other being just north of Deadwood which takes you to Balamb island.
Mod Town is the the north west Town on the map. It is home to the guild Council, Handle Furniture and Adam's Treehouse which is where you get the bug net. there is also a circus tent to the north west that sells balloons and other than that it's purpose is unknown.