"Salsa" is the Latin word for "salted", and in the Concordia: Salsa expansion for Concordia, players will find:

Two new maps: "Byzantium" and "Hispania" Salt: Wooden salt tokens (a sixth commodity) and city tokens for salt-producing cities. Salt can be exchanged for any other commodity at any time, making it essentially a "wild" commodity. The Forum: A new deck of Forum cards that players can acquire during the game. These cards are all unique and grant abilities and bonuses to salt your game with new strategic challenges.

The two new modules (Salt and Forum) can be used with the new maps as well as those of the base game and all other expansions, thus giving even more variety.