If you want to see an unusual generation such as mansion in the middle of the lake, after the start, go through the swamp to point 168 ~ 168. Also here you will see a large biome of mega taiga and mesa. Near the mansion, at 92 ~ 265, you will find a Nether portal. The nearest village to the spawn is located at coordinates -332 ~ -236, and it is abandoned.
How to use Mansion in the Middle of the Lake seed
Start the Singleplayer mode
Select ‘Create New World’
Then click on ‘More World Options…’
In the ‘Seed for the World generation’ field, enter 5820348692762971680