What is the fine-grained topic of the following text: La Carte de Tendre was a French map of an imaginary land called Tendre produced in the 17th Century, which depicts the "geography of love" according to the Precieuses of that era: the River of Inclination flows past the villages of "Billet Doux" (Love Letter), "Petits Soins" (Little Trinkets), and intrepid travelers brave the dangers of "Le Lac d' Indiference" (Lake of Indifference). Only return the topic.
17th Century French Map Depicting the Geography of Love