Jang Hui River

Little is known about the Jang Hui River, except for the fact that the town of Jang Hui (which is named after the river it is on). Its only appearance is in the episode "The Painted Lady". It is highly polluted, so much to the point that it has become a sickly green color and Sokka making a bad joke about how his fishing skills were usually "off the hook". Toph then complains that it would be much better if your skills were on the hook, and the whole team (with the exception of Sokka). There is a Fire Nation factory there as well which is the main cause of its pollution. The factory is later destroyed by Aang and Katara, who is under the disguise of the Painted Lady Spirit. General Mung, who was apparently in charge of the factory nearly burned down Jang Hui ( the village, not the river)but was thwarted by Katara (still disguised as the Painted Lady Spirit). Once Mung and his Firebenders were beaten, Dock/Xu/Bushi realized that she wasn't the real spirit, but "that Waterbender he met earlier. Although the town is outraged that she dared to even try to impersonate their Painted Lady Spirit, but Sokka intervened. after the episode, Katara and Toph are shown waterbending / earthbending in the river to purify it.

It is unknown what ever happened to the river or the town located on its banks after The War, but it is speculated that it was much more productive afterwards.