The phrase "digging area" refers to a designated space where digging is allowed or encouraged.
Sentences with «digging area»
The poor pup next door tries to dig under the fence, and I am concerned because his choice of digging areas involves a buried utility cable. (pethelpful.com)
They also love to dig and owners should ideally provide their Lagottos with a sandbox or designated digging area where they can indulge in this tendency. (petguide.com)
Provide him with his own digging area full of buried treasures — toys, and certain food treats (just be sure to avoid giving him ones you don't want to spoil and stink up the yard!). (dogobedienceadvice.com)