If space were not infinite, the question of what would be at the end of space would depend on the nature of the finite space itself. The possibilities can vary depending on different cosmological models and theories.
In some models, space could be finite and closed, meaning that it curves back on itself, similar to the surface of a sphere. In this case, if you were to travel far enough in any direction, you would eventually return to your starting point. There would be no distinct "end" to space, but rather a continuous and connected universe.
Another possibility is that space could be finite and open, meaning that it extends indefinitely without curving back on itself. In this scenario, it is difficult to imagine what would be at the literal "end" of space because it is beyond our current understanding and observational capabilities. It could be speculated that there might be some unknown boundary or transition region, but it would be purely speculative as there is no empirical evidence to support or define such an end.
It's important to note that our current understanding of the universe suggests that space is indeed infinite or at least extremely vast, based on observations of cosmic expansion and the large-scale structure of the universe. However, the nature of space and its boundaries, if any, are still topics of active scientific research and exploration.