I was snooping around the dev tools and noticed an option to create a "Debug Arena". I decided to try creating one. I immediately got an error though that it hadn't been setup correctly, but it added a location on the map called "Site".
I realized that I'm on permadeath and didn't know what would happen if I visited it, so I never went near it. It's stuck on my map now though, and also creates an error every time I start the game. See the screenshot for the debug logs, and a picture of the "Site" (with my settlement to the left of it).
I've searched all over the dev tools to find an option to delete map sites, but haven't found anything.
How can I remove the site?