The Geological Factor is a mini-expansion for Barrage thatintroduces a new level of challenge and additional variety to the game. Each basin will be characterized by a particular difficulty in using or building some components of the game and they will provide a specific effect linked to the component itself. This expansion can be used with all maps of the game and is compatible with all expansions released so far (i.e.,Leeghwater Project, The Nile Affair, Map for 4-5 players).