Final answer:
The Seine River runs next to the location of a party in Guy de Maupassant's 'The Necklace' and is depicted in various works of art as a cultural and social hub in 19th century France.
Step-by-step explanation:
The river that runs next to the location of a party in Guy de Maupassant's 'The Necklace' is the Seine River. This river is not only central to the setting of various literary and artistic works but also to the social and cultural life in France portrayed in the 19th century.
One famous painting, the Luncheon of the Boating Party by Pierre-Auguste Renoir, captures the essence of the leisurely life along the Seine, depicting a group of Renoir's friends enjoying an afternoon on a balcony overlooking the river.
Similarly, early works by Claude Monet, such as La Grenouillère, illustrate the popularity of the Seine River as a place for Parisians to engage in social activities such as swimming, boating, and dining. These works reflect the vibrant life along the Seine, making it a significant cultural symbol in France.