Human: Write a detailed description of a dreary scene outside a river with growths, a stream, and water-weed. Assistant: 
A thin margin of fen runs down to a muddy riverbank. South of that, a small river flows sluggishly, the current checked by tremendous growths of a drab-green water-weed that has formed thick mats across the stream. An occasional fish breaks the soupy water to snatch at the unending clouds of midges and water-dancers that swarm above the stream.