I decided to put the anniversary monuments on an island that fits their centerpiece, as well as putting the amount that corresponds to their number (like three 3rd anniversary monuments). This may look like island flexing under a fancy name, which I'll admit, it sure is.

**Explainations for every island:**  
1st Anni - Ethereal Island = Ethereal Island. Do I really need to explain?  
2nd Anni - Rares = Cold Island. It's the 2nd island chronologically, and is also blue. Rare Mammott also kinda looks like the rare symbol.  
3rd Anni - Tribal Island = Fire Haven. The fire islands are connected via tunnels, and that includes Tribal and Haven. Also, Kayna makes this self-explanatory as well.  
4th Anni - Mirror Islands = Mirror Plant Island. Another self-explanatory one like Ethereal. I might consider putting it on the other mirrors too once I get them...  
5th Anni - Wublin Wubbox = Wublin Island. wow i wonder why  
6th Anni - Epics = Earth Island. When Epic Noggin was teased, people thought it was the Earth Colossal waking up. It even looks like a smaller version of it.  
7th Anni - Magicals = Psychic Island. yeah go figure this one out yourself  
8th Anni - Colossingum = Celestial Island. You can't actually put it *on* Colossingum, but Celestial Island was the closest island to it before the map update.  
9th Anni - Seasonal Shanty = Seasonal Shanty. uhhhhhhhh (Also, while this one doesn't have nine copies, it does feature the other monuments, which fits a lot more.)  
10th Anni - Mythical Island = Mythical Island. getting real creative here  
11th Anni - Gold Epic Wubbox = Amber Island. It's the only other island on the Higher Plane.  
12th Anni - BeMeebEth = Ethereal Workshop. *insert funny "guess why lmao" sentence here*

I haven't put the 13th monument yet because I didn't play during the 13th anniversary month, but I still don't know what island fits best for the... friends thingy. But some suggestions wouldn't hurt.

Creativity with Anniversary Monuments