A custom made island with several different territories. In addition to the natural biome resources, each territory/biome (besides mushroom isle and middle plains) has custom resources as well. For example the Badlands has more gold ore than any other biome, the desert has more copper ore, while other biomes instead of ores have other blocks that aren't as easy to get a hold of like prismarine or amethyst. You can see the list below for reference. In addition to this, each territory has guarded treasure. Some of the sunken ships will lead you to them, while others you will have to get lucky and find on your own. The map is about 2500 blocks in diameter and turns into the default world after the ocean border. Have fun building and claiming your territories!

Resource guide:
Badlands: +gold ore
Desert: +copper ore
Savanna: +redstone ore
Spruce Forest: +lapis ore
Stone mountains: +emerald ore
Birch Forest: +iron ore
Dark Oak Forest: +coal ore
Jungle: +Quarts ore and dungeons
Mangrove swamp: prismarine and crying obsidian
Oak forest: +bee hives, flowers, mules, and deep dark
Amethyst mounds: amethyst, calcite, and a little gilded blackstone
Snow plains/mountains: glowstone/sea lanterns
Floating islands: End portal room
Plains: Village (no special resources)
Mushroom island: no special resources
Ocean: no special resources