Felwood, the green unpleasant land bordering Darkshore, is a sickly, diseased place. The wildlife is rabid, with large gashes and weeping sores covering the bodies of the wolves and bears, and many of the trees have been altered to feature twisted "faces", complete with dripping green ooze for saliva. Even the elven lanterns that light the road are corrupt. For certain, questing in Felwood is an uncomfortable experience, with most of the objectives based on cleansing the demonic taint. It's no surprise that the questgivers here are members of the Cenarion Circle.
Unlike Feralas, the green of Felwood is far from lush – rather it is the green of poison and decay and worse. In spite of all this, however, there are a few plants still remaining free of the illness which has soaked into the land, and the owls of the region likewise seem untouched.
Ancient elven ruins mark the entrance to the demonic enclave of Jaedenar in the west of Felwood, where the Shadow Council go about their business.
Shatter Scar Vale. The burnt patches were caused by infernals and fire elementals landing here during the invasion of the Burning Legion
In Irontree Woods, in the north of the zone, these three Ancients – Hastat, Stoma and Vartrus – have been permanently petrified.
Corrupt treants also wander Irontree Woods.
As you can see, Felwood is by no means a pretty place, but nonetheless I feel is quite interesting, particularly in the effect is has on players questing there.