From the Paizo website:
Lonely, Dark, and Deep
Whether sneaking through the undergrowth to preempt a bandit ambush or hunting elusive forest creatures, the possibilities for adventure are endless with Pathfinder Flip-Mat: Bigger Forest. With an area that's 45% larger than Pathfinder Flip-Mat: Deep Forest at their disposal, Game Masters can now dream even bigger! This massive gaming accessory presents both a thriving forest and a blighted, dead stretch of former woodlands, which can be home to everything from monsters to outlaw archers to ancient druids.
Don't waste your time drawing every stump and knot of shrubs. With Pathfinder Flip-Mat: Bigger Forest, you'll be ready the next time your players head into the woods!