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
- Complete Guide to Unlocking the Coldflame Tempest Mount in WoW Patch 11.0.5
- Ultimate Class Guide to WoW 11.0.5 Patch: Winners and Loosers
- M+ Overview Before Patch 11.0.5 - notable shifts and trends
- The Real Prep for the 20th Anniversary: A Guide to Earning Bronze Celebration Tokens
- New Cosmetic Items Available at the Undercoin Vendor for Patch 11.0.5
- Overview Before Patch 11.0.5 - DPS Specs Performance & Popularity
- Blizzard Clarifies Functionality of Severed Strands Raid Buff
- Comprehensive Guide to WoW's 20th Anniversary Celebration (Patch 11.0.5)
- 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!