Level curves refers to lines on a two-dimensional map that connect points at the same elevation or altitude. They are also known as contour lines or isoheights. Synonyms for level curves include contour lines, topographic lines, elevation lines, and isopleths. These lines are an essential feature in cartography and topography as they provide critical information regarding the terrain's characteristics and structure. Other related terms that refer to level curves include slope, relief, gradient, and incline. These terms help to describe the shape and features of the landscape and are important in various fields such as geology, geography, and engineering.