Garden design

How can I power a small fountain/pump 50 ft from an outlet?

I am making a 25-30 gallon container water garden with a couple goldfish. I would like to have a filter/fountain in it, but where it will be is 50′ from the closest electrical outlet. A solar fountain is out of budget, so I would like to run an outdoor extension cord under the ground. Years ago, my Dad ran two 100′ unprotected outdoor cords between two houses and left it there for about 5 years without problems. But my situation is a little different. It will be underground, and it will be running almost constantly. Is this feasible? If so, how can I protect the plug at the pump? Electrical tape?
Thanks!

Run from the closest outlet to the fountain using the appropriate size wiring for the current load. Use UF cable not the NM. Bury the wire to the required depth, we use 18″ here, and come up with conduit and to a weatherproof box, as was mentioned in the other answers. The UF is good for direct burial, but if you’d feel safer, or you are going to be digging in the area with plantings then run it in PVC pipe for extra protection. Good luck.

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