"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: Adds a new sixth commodity, salt, that is produced in salt cities. Salt can be exchanged for any other commodity at any time, making it essentially a "wild" commodity.
The Forum: Adds a new deck of Forum cards that players can acquire during the game. These cards grant unique abilities and bonuses to salt your game with new strategic challenges.
...