I have have true koi ponds up north. wow are the Koi big and the raccoons enjoy them. no worries it all about free range there. more koi than the blue herons and raccoons can catch. I"m sticking with a english theme here? a square pond in the location around where you said. maybe a garden statue of a boy peeing in the pool type thing ?
I plan on building a small garden shed along side of it. my old shop I had several ponds that I made that are out standing, and no predators. a real joy to listen to and to view from the shop window
And in all my ponds, wow you should see how big my channel cat fish are. when I purchased them they where tiny and now their longer than my arm. Insane !