These are the leaves of a Japanese Maple Tree hanging over a small stream of water.
In Japan these maple trees are pretty much everywhere. They speckle the landscape with thier unique shades of green and in the fall they change their color to a nice red. Often times the Japanese will make them into small little bonsai trees.
This photo demonstraits the awesome bokeh of the Canon 24-70mm f2.8L lens when it's wide open.