Prompt
                                        
                                            Generate an image of a serene, 9.3-mile-long river flowing through the counties of Norfolk and Middlesex in Massachusetts, United States. The river, named Stop River, should be depicted as a tranquil waterway with lush greenery and trees lining its banks, reflecting the natural beauty of the area. The source and mouth of the river are both located in Medfield, Massachusetts, and it flows gently into the Charles River. The image should be a realistic representation of a river landscape, capturing the peaceful atmosphere of the Stop River in a style reminiscent of a watercolor painting or a serene photograph.