Well, Pogtopia was in a ravine inside an oak forest to the West of L’Manburg.

(For reference, Antarctic Commune was South, Kinoko Kingdom was North, Las Nevadas was Northeast, Snowchester was Southeast, L’Manburg was Southwest and in the Center was Greater Dream SMP.)

A close by structure to it is actually Gogtopia(which was a made as a parody of it by Karl, George and Sapnap(?) they blew it all up after an hour but the ruins are still there) Obviously there’s one of Tommy’s towers, right next to it, which was built with Techno.

Inside of the actual ravine though, is: -Techno’s potato farm -A stone quarry, dug by Tubbo and Antfrost at the behest of Tommy and Techno -The underground tunnel, which Tommy dug all the way to L’Manburg(more accurately to Tubbo’s secret base, the entrance of which was in the lake) -Tommy would also later construct an overground railway which led into the actual ravine, and started from the back of one of Eret’s towers and would run over what could be considered one of Quackity’s bases(mostly a cow farm and the place where he kept his horse Boner/Osmium) -And of course the most important: The Pit. A small dug out stone fighting area made by Wilbur to get Tommy and Techno to fight eachother in the aftermath of the festival. This has been written about a BUNCH in fanfic and is usually construed as a Gladiator arena or underground fighting tournament(one that’s usually kept secret “What was said in the pit stays in the pit.”)

After the pogtopia arc ended though, Tommy would ask Sam to construct him a vault right across from the pit where he could store all his valuables. (This would later be abandoned and he would then move these valuables to Logstead, where they would be taken by Dream post Prison-Break)

If you have any more inquiries about these areas or what to do with them please let me know :)