Sandpit n. : A pit or excavation from which sand is or has been taken.

Example:
How do I train cocker spaniel to poo in Sandpit?

Taxonomy
Sandpit, Sand art and play, Wikipedia sandbox, free encyclopedia, lids, soil, cheaper, mixture, Personal tools, search, experiment, editing Wikipedia, meanings, Unsourced, perspective, container, shallow depression, homeowners.

Defination from the web:
... 75-Million Industry Park Planned for L.I. Sandpit" (Subscription required). The New York Times: p. R1. ...