Destiny 2: Shadowkeep Lost Sectors Moon Locations Guide features all of the spots you'll need to head to locate these Lost Sectors. These are small secluded areas that are a bit hidden, but can be searched and looted for some decent treasure! You'll also likely have to go to a few of these specifically to complete various missions and quests.
Lost Sector Moon Map
There's currently four Lost Sectors that we know can be found on the moon at the moment. The number listed below the name of each location is the recommended power level that you'll want to be to attempt completing the area. If you're too low, you won't be able to do any damage to the enemies there and their level will just show up as question marks!
K1 Crew Quarters - Power Level 880
The entrance can be found a bit north of shown location on the map. Look for the greyish building and head inside of it. You'll see some missing floor further in the room, go down into it and follow the path and you will run into the Lost Sector.
K1 Logistics - Power Level 870
Head into the large building area on the first floor at Archer's Line. Go towards the left side of this area, and you should find the above entrance. You'll know you're in the right place if you see some spooky red phantoms lingering around.
K1 Communion - Power Level 860
In the Anchor of Light area there's a pretty big building where this Lost Sector is shown on the map. Head inside and on the first floor you should find a room that looks like the one depicted in the image above. Run through that area and you will run into the K1 Communion.
K1 Revelation - Power Level 890
Head over to Sorrow's Harbor and pretty much right in the middle of the map is the Lost Sector location for this area. Go exactly where it shows on the map and look for the above cave location to find the entrance. Make your way through the cave and you'll come to the K1 Revelation Lost Sector!