With patch 2.7, Channels also increases the speed of Caravans.
The capital city of Atlantis was ringed by nine great canals. These canals allowed citizens, soldiers, and goods to be transported quickly around the huge city. The Theocrats of the city decreed that the water be kept very clean. Anyone caught sullying the water faced a stiff fine or possible imprisonment. When Atlanteans left their beloved city, they would toss coins, even jewelry, into the waters of the canal for good luck and a safe return.