Dajkah Inlet - how to get there?

I want to get to the 1st of the 2 challenge missions, but I can't seem to find it. Wiki says it's called Dajkah Inlet and says how to play, but doesn't give details on finding it. I've been through the game, and don't have it on my map. Any help?

Head north from Nundu Bay.
Or if you're even missing Nundu Bay. Head west from Yohlon haven, get Bay first and then head north. Alternatively, head southwest when you're in the sunward marches.

There we are. I must've passed it not wanting to lose my blessings, and then forgotten it was there. Many thanks.