The new zone in patch 10.1 is called Zaralek Cavern and is located under the entire Dragon Isles. It is a big Cavern in which you can also fly around there.
There are 3 entrances to enter Zaralek Cavern. All are located in Ohn´aran Plains. You will be introduced to that new area via the main questline.
Other posts
- Exciting New 12-Month Subscription Package from Blizzard
- The War Within Weekly Dungeon Event: Complete 4 Dungeons for a Heroic Nerub-ar Palace Loot Cache!
- New Severed Threads Nerub-ar Palace Buff Now Active – Enjoy 2.25% Bonus Damage and Healing!
- Maximize Your Weekly Gear in WoW's 20th Anniversary Event
- Comprehensive Guide to Bronze Celebration Tokens in WoW 20th Anniversary
- Transform into Iconic Warcraft Characters in 11.0.5 20th Anniversary Event
- Mists of Pandaria Classic?
- Kamala Harris Faces Backlash Over World of Warcraft Stunt
- Understanding Xal'atath's Bargain: Devour and the Void Rift Debuff
- The War Within: A Major Shift in Tinderbox Economics