“White water” is the water of a river when it moves very fast over rocky areas. As the water fills with air bubbles, it looks white. The areas of white water are the most exciting areas for rafters---and also the most dangerous. In fact, rafting guides must always be on the lookout for white water. And rafters must be ready to swim because the raft can tip over in white water. For that reason, rafters must wear special life vests that will keep them afloat.