LEGO Green Baseplate 48 x 48 has been used in at least 1 LEGO sets over the past 15 years, since it was first used in 2009. You can also find this
LEGO Green Baseplate 48 x 48 (3497 / 4186)
LEGO PLAQUE De Base 48X48 --- EUR 11,99 - PicClick FR
Gobricks GDS-530 Plate 16 x 16 compatible with lego 91405 pieces of children's DIY Building Blocks Technical
You can also find this part in at least 18 other colours.
LEGO Dark Blue Baseplate 48 x 48
LEGO Baseplate 48 x 48 (3497 / 4186) Comes In
LEGO 10701 Classic Grey Building Plate, 38 cm x 38 cm, Educational Toy, Creative Play: : Toys
size - What is the largest single LEGO piece? - Bricks
LEGO® 4186 4219806 - 4278193 - ToyPro
Bricker - Part LEGO - 4186 Baseplate 48 x 48
Plaque de base 4186 48x48 points pour blocs de construction, 1 pièce, accessoires à assembler, remplaçable, changement, cadeau pour enfant - AliExpress