Adjacent refers to the current square and the four orthogonal squares that share a border with it (not diagonals). For example, the middle square has 5 adjacent squares - itself and four others. If a square is in the corner of the realm, it will have fewer adjacent squares. For example, the bottom right square has only 3 adjacent squares - itself and two others. When referring to adjacent sites, adjacent voids, or adjacent squares, the effect can cross the boundaries of regions. For example, Lord of the Void can be in the void and still banish an adjacent site, even though sites and voids are in different regions. Frontier Settlers can be on a site and still play your top site to an adjacent void, even though sites and voids are in different regions. For all other references to adjacent, such as adjacent locations, adjacent minions, adjacent artifact, etc., regional boundaries must be respected and cannot be crossed. For example, if a minion with Voidwalk was attacked while at a site and then played Dodge Roll, it could not move to a void square because 'adjacent location' cannot cross a regional boundary.