What is the name of the hypothetical industrial town that features a high plateau and a level valley alongside a river?

The name of the hypothetical industrial town that features a high plateau and a level valley alongside a river is best described as "Une Cite Industrielle." This term translates to "An Industrial City" in English and is associated with the ideas of urban planning and industrial design proposed by architects and planners in the early 20th century, notably by figures such as Le Corbusier. This concept envisions a planned industrial city where functionality, living conditions, and the environment are integrated to promote the well-being of its inhabitants. It emphasizes the importance of location regarding natural features like plateaus and rivers, which can influence the layout and operations of industrial activities.

The other options represent different concepts or historical references. El Dorado is a legendary city of gold from early exploration myths, New Lanark is a real historical site known for its model village created by Robert Owen focused on social reform, and Garden City refers to a specific urban planning movement aimed at creating self-contained communities surrounded by greenbelts. Each option has its significance, but the term "Une Cite Industrielle" aligns directly with the description provided in the question, making it the most appropriate answer.