Quick Ways to Travel Around Zereth Mortis - Korthia Whistle, Gunshoes

wowhead.com:

As you complete World Quests, find treasures and kill rares on Zereth Mortis, there are a couple items that can help you traverse the zone!

Gunshoes works on Zereth Mortis, allowing you to travel quicker than a mount for a short period of time. This is great for when you want to cross a large open field! Try to have a set of these in your bags!

The Silver Shardhide Whistle obtained from Korthia works on Zereth Mortis! Similar to Gunshoes, this item allows you to move quicker than a mount for a period of time. Need to get to a rare or want to get your World Quests down faster? This toy can go back on your action bars. Alternate Silver Shardhide Whistle and Gunshoes to optimize your travel.

Of course, with every new zone, there are plenty of opportunities to use a Goblin Glider Kit, whether to save yourself from dying to fall damage or to move across the zone by jumping from an elevated position. Don't leave home without them!