河流三角洲白板动画

A top-down aerial view of a river delta: a single river flows down from the top of the picture and, near the coast at the bottom, splits into four or five branching channels that fan out into a triangle shape. Between the channels are low sandy and green islands of deposited sediment. The channels empty into a blue sea along the bottom edge, with lighter muddy water where the river meets the sea. Nothing else in the picture: no boats, no buildings, no people. Lots of clean space, 4:3. Coloured pencil and watercolour marker, clean black ink outlines, warm off-white paper, no text.