Choppy water in separate dashes of color
The whole lower two-thirds of the canvas — the entire stretch of river surface
This is the technical headline of the picture. Look closely and the water is not painted as a smooth pane or a mirror — it’s slate blue, emerald, white, ochre, and dark brown, slashed across in short, separate, mostly-horizontal jabs of unmixed paint. Where the trees on the far bank reflect, Monet doesn’t paint a mirrored shape — he paints continuous horizontal bars in the colors of the reflection. Step back and your eye does the mixing on its own.