The Riven Seed

You spawn right next to a water hole, that if you go down there is a giant riven that goes under the whole map (you may have to break some blocks to connect it to other caves)

You can either have the seed to start you own world.
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Or you can download the pre-made world (of mine) with a farm and house and even a diff way up and down the water so you don't drown =)

Enjoy the map :D