megahex

A regular, quasi-circular polygon made up of multiple hexagons used to indicate a different scale, range, or area of effect on a hexagonal grid. Commonly used on maps for some tabletop war games and roleplaying games.

All creatures within five megahexes of the wizard will be thrown to the ground, and take one hit damage from cuts, bruises, and contusions.

To avert this, hexes are grouped into 'sevens' to give large "megahexes", a unit can search it's [sic] own "megahex" or up to two "megahexes" away.

An irregular grouping of hexagons indicating a single area on hexagon-based game map.

There's one irregular and over-sized "mega hex" on the map: the "Shobu Group Base Area" in west-central Luzon.