No, I meant in Felucca Despise Dungeon.
Where there are 2 roads connected to the island.
on the WEST road, the land is ok.
However, on the EAST road, you will see many "bridge tiles" that cover about 3/4 of the road. Those tiles are preventing people to cast on it.
Though, some people just probably have programs to get rid of those "bridge tiles" on their screen and take the advantage of casting fields on top of it.
Actually, it is quite a big advantage.