From the back of the package:
Dig Deeper
Does the darkness cloaking these twisting passageways hide ancient treasure or unimaginable horror? Paizo Publishing's latest Pathfinder Map Pack provides simple and elegant tools for the busy Game Master. These 5" x 8" map tiles can be positioned to form a variety of mysterious underground tunnels, or combined with tiles from Pathfinder Map Pack: Cave Chambers to create an enormous earthen complex. Inside you'll find 18 richly illustrated map tiles, including:
Cavernous Maw
Weathered Stairs
Buried Crossroads
Underground Stream
Subterranean Grotto
Hidden Entrance
Game Masters shouldn't waste their time sketching maps every time characters step into a gloom-haunted cave mouth. With Pathfinder Map Pack: Cave Tunnels, you'll always be ready no matter which way your adventurers turn!