流域白板动画

Hand-drawn bird's-eye view of a watershed, looking down from above at a bowl-shaped valley: green and brown hill ridges form a horseshoe around the top, left and right edges of the picture, with a few small pine trees on the slopes. Four thin blue streams start high on the slopes and flow downhill, joining together into one wider blue river that winds down the middle of the valley and flows into a round blue lake at the bottom of the picture. Nothing else in the picture. Coloured pencil and watercolour marker, clean black ink outlines, warm off-white paper, no text.