I'm in the midst of my fourth year keeping eastern box turtles and every year the garden has been tweeked to some extent. This year I decided to upgrade the fence entirely. I staggered pressure treated 2×8s that were cut in 3 foot sections and then buried about 6-7" underground. All in all its a completely enclosed garden about 300 square feet including a small bog that is 6' x 4' and varies from 6" to a foot deep. There are also six slate hides and several hollowed logs. We keep 4 females and a single male in the pen. The pics are dated a few months before everything started growing here in central NJ but hopefully you get the idea.