Since Forsena was liked by so many, I created Runesia staying with the theme of Brigandine. It's a little bit larger than Forsena (about 5300 blocks), then turns into a default world after the ocean border. I tried to incorporate as much vanilla Minecraft structures as I could, while adding a couple unique things of my own. Hope you all enjoy!

Structures included:

3 Strongholds (84/-1,644) (-1,324/788) (1,604/1,204)
1 Woodland Mansion (1,800/232)
1 Ocean Monument (1,288/872)
6 Custom sunken ships and treasure (-1788/60) (-545/-900) (1400/-1175) (1870/-485) (485/920) (-865/900)
4 Ancient Cities ( -520/-51/-1,064) (2,056/-51/-312) (1,176/-51/1,624) (-168/-51/1,752)
1 Jungle Temple (728/1,800)
1 Pyramid Village (-600/-220)
1 Vanilla Village (870/262)
4 Floating Islands (-700/-1600)
5 Ruined Portals (sorry, don't have coordinates)