Most polluted is the 100-kilometre downstream stretch—a meandering stream from above the confluence with the Yarmouk to the Dead Sea. Environmentalists say the practice of letting sewage and brackish water flow into the river has almost destroyed its ecosystem. Rescuing the Jordan could take decades, according to environmentalists.[1] In 2007, FoEME named the Jordan River as one of the world's 100 most endangered ecological sites, due in part to lack of cooperation between Israel and neighboring Arab states.[21]