Gaming sites and youtube videos just show people walking around to the Keepers and not actually a map. I found landmarks while grinding and decided to capture screenshots for my group of friends. Hopefull this helps someone out there.
The Landing:
If you're by the red hand, here's the cave where the keeper is at:
The blooming:
If you're in the bog area where the Tier 4 boss spawns, you can head up between these two cliffs and follow the wall till you get to a smaller cliff and a stump. There's a cave in the wall at the edge of the map with a green tintish glow:
The Impasse:
I’m not sure if anyone’s confirmed if it all has to be done in one session. The times that I’ve done it I’ve done it in one session because I didn’t want to risk it
Secret Keeper of the Witch Queen locations - map with screenshots
destiny2