What are imaginary lines that join points of equal elevation called?

Imaginary lines that join points of equal elevation are known as contours. Contour lines are essential in topographic maps and site planning because they illustrate the three-dimensional shape of the land in a two-dimensional format. Each contour line represents a specific elevation level, allowing one to visualize slopes, peaks, and valleys.

Understanding contours is crucial for various aspects of site planning, including determining drainage patterns, assessing land stability, and making informed decisions about building placement. They help planners and architects gauge the terrain's impact on construction and landscape design.

The other terms in the question refer to different concepts. Latitudes and longitudes are geographic coordinates used to define locations on the Earth’s surface, measuring angular distance north or south of the equator and east or west of the Prime Meridian, respectively. Regions refer to broader areas defined by specific characteristics or boundaries, but they do not relate to elevation. This distinction clarifies why contours are the correct choice for describing lines that indicate equal elevation.