From the publisher's website:

Delve deep into Catan! In Catan: Traders & Barbarians you'll find lots of cool new ways to explore Klaus Teuber's award-winning game series. You can now play with just 2 players! Add a harbormaster, a friendly robber, or special events. Play with a wealth of new wooden pieces and capabilities. You can even link your games to create an intriguing campaign. Use these 4 variants and 5 scenarios to reinvent your Catan experience! 5 Challenging New Scenarios: The Fishermen of Catan- Fish in the great lake or try casting in rich coastal shoals. A fresh, expanded, and updated version! The Rivers of Catan- Not one, but two, great rivers invite flourishing commerce. Bridge them en route to glory and wealth. The Caravans- Nomads of the oasis seek wool and grain. Camel caravans offer trade. Barbarian Attack- Eager for booty, vile barbarians land and occupy Catan's fertile shores. Brave knights unite and ride to battle. Traders & Barbarians- Your wagons transport fine marble, glass, tools, and sand to help restore Catan's castle to splendor. Combine these rich scenarios to create a compelling campaign! Requires ownership of The Settlers of Catan to play.