If indeed it is finite, that means it has a starting point and an end, yet, you say it is unbounded.That is why I said the known universe. BTW, how small is small and how big is big???
Talking topology here. That is Poincare. Doesn’t have to make sense, it’s mathematics, which since Descartes describes and rules the world.
Put another way, how does it look like it is 17 billion light years to the edge in every direction from here? We must be at the center.