Acer macrophyllum, the bigleaf maple, is a large deciduous tree in the maple genus. It is native to western North America, mostly near the Pacific coast, from southernmost Alaska to southern California. It commonly reaches 50–65 ft tall, but may be smaller in Southern California where it is generally found in riparian areas. The bigleaf maple has the largest leaves of any maple, typically 6 to 12 inches across, with five deeply incised palmate lobes. In the fall, the leaves turn to gold and yellow before falling from the trees.

Source: wikipedia.org