Two (2) Lego Raised Baseplates with Ramp and Pit - #2552 32x32 /10"x10" | #1721209147
BrickLink - Part 2552px4 : LEGO Baseplate, Raised 32 x 32 with Ramp and Pit, Water, Green Stones Pattern [Baseplate, Raised] - BrickLink Reference Catalog
Lego 2552 Raised Base Plate 32x32 - Blue & White Snow Mountain Ice Canyon Ramp | eBay