I was unable to get a top down map of the game world but hopefully the high altitude images I took will suffice. The Yellow Stars on the first two images mark locations where OutofBoundium ore can be found. The images following it show the areas close up.
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Note: Some of the stars represent multiple ore nodes around that location.
Note 2: At least 2 locations have changed during this version of the game in minor updates despite the game version not changing, But this guide is accurate to the best of my knowledge.
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Location 1:
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Location 2:
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Location 3:
This location is the 2 highly visible nodes next to the pink unicorn
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Location 4:
This area is just off the edge past the pink unicorn and the 2 nodes above by the water.
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Location 5:
This star covers 3 nodes
This first one sits just inside the courtyard or gatehouse of the castle, The second one sits inside the very front bottom left gatehouse tower, and the third one is inside the front bottom right battlements tower.
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Location 6:
This star actually represents 3 nodes, The first is up inside the castle walls next to the entrance, the second is inside of the castle walls behind it, and the third is up on the back middle ramparts of the castle.
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Location 7:
This area is out in the upper field behind the castle, it's visible from the back top right ramparts but it's a little small in this picture.
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Location 8:
This location is up on the top of the mountain nearest the colorful hovering crustal, Get to the point closest to it you can and turn left is the easiest way to find it, for some reason that's feels like the only angle you can see it from, or I always just pass it.
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Locations 9 & 10:
I'm listing these together because they are "special" locations, they are by far the largest nodes of outofboundium ore but they only appear on days you can see the rainbow. To get them just visit both ends of the rainbow they are impossible to miss but it's a long treck, I recommend installing ziplines as soon as possible.
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Location 11:
Contributed by: alizandriat
Added in a recent update if you continue to go north past the node at Location 1 you will come across, just to the left of the bottom of that ramp are 2 new nodes.
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Location 12:
Contributed by: PablitoCristo
Added in the same update as location 11, Head north of nodes 1 and 2 until you see 3 giant trees, when you are almost there turn and face south and there is 1 new node at the base of the small cliff.

Sept 14th 2025: 2 nodes have been added to the guide at star 5 inside of the towers, thanks to ozma64 for letting me know they were added.
- On a related note, I hate the stairs inside of the towers.
Sept 18th 2025: 3 new nodes have been added, 2 at star 11 and 1 at star 12 thanks to Alizandriat and PablitoCristo for letting me know they were added.

If you're aware of any outofboundium ore nodes not included here or if any of the locations change and I haven't updated this guide please let me know and I will do my best to update it as the game updates!⠀
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If you've found this guide helpful at all please remember to rate it, thanks for your time and I hope the info provided makes the game more enjoyable for you!