Shipwreck
Some ocean variants are available as biomes too.
Stronghold
The stronghold exists, therefore beating the ender dragon is possible.
Crimson Forest Island
The Crimson Forest Biome as an island, aswell as a few other islands visible far away.
A few other islands.
The river biome, and a few other islands, are visible here.
Islands Surrounding Starting
Some islands that surround the starting island.