Far in the northern Esper Mountains, Neydisa Castle stands as an outpost of civilization. It's remote location and easy access make it a perfect staging area for ventures into the north.
Portal Connections
A Neydisa portal can be found in Holtburg, as well as Jungle Shadows, one of the Portal Nexus Dungeons.
While there are no portals in Neydisa itself, a short run south to the Mattekar Cave can connect you to Bandit Castle without having to run east on the long road.
It should be noted that one of the easier ways to get to Mt Esper Crater is to run west from Neydisa to the north face of the mountain, where you can climb to the rim of the crater.