Disclaimer: All information is provided "as is" and with the best of intentions. However, I don't know everything, I am not a veterinarian, and I make mistakes. You are responsible for verifying any advice given on these pages!
This example (not mine--I don’t have source information) shows how a natural and nice-looking small pond can be made from just a couple of tubs and a pump. The tub on top is used for filtration. This would be nice for small or baby turtles.