This Explorable Area is in the southern part of the Charr Homelands. It is home to some of the deadliest creatures and is the only explorable area known that has been set on fire. It is also an exclusive home to the Raven, one of the 4 pets that can fly.
A prepared party can clear the area in around an hour, yielding at least 4000 Ebon Vanguardreputation points, which makes this the best place to farm Vanguard points.
All of the Worms in the southwest corner must be defeated.
The Siege Devourer (only present in Hard mode) can be subdued and then ridden, and you can take it into either of the adjoining areas, Grothmar Wardowns and Dalada Uplands. You can also bring the siege devourers from both of those areas to Sacnoth Valley, allowing a party to control up to 3 siege devourers at a time.