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Sidewinder is a very flat road/traverse from the base of the Harmony Express to the base of the Emerald Express.
This is an option for your way out of the Harmony zone if you are unwilling to wait in a large line on Harmony to merely get out.
That being said, this traverse is very flat throughout, so keep your speed as best as possible.
You will see it marked to the right of the Harmony base, if you have come down from Burnt Stew it will be straight ahead.