All are very rare biomes in Minecraft PE are gathered in one place. Do you think that this is another seed? No, this is a map called Random Custom Terrains.
As you could already tell from the images – before your custom location. Don't worry, the map was ported to MCPE, so that the world conducts itself in the same way as the normal game.
Moreover, this location was embedded in another one who generated randomly, so that the study will take about one hour.
Install Random Custom Terrains Map
- Download the map
- Remove the map from the archive
- Move the map by path: "/games/com.mojang/minecraftWorlds"
- Go in Minecraft PE > Play > Select the installed map
- Enjoy the game!