What do the contour lines on a map ultimately represent?

Contour lines on a map represent the shape and elevation of the land's surface. Each line denotes a specific elevation above sea level, and the spacing between the lines indicates the steepness of the terrain. When contour lines are close together, it implies a steep slope, while wider spacing suggests a gentler incline. This feature is crucial for understanding the topography of an area, assisting in navigation, planning, and search and rescue operations by providing essential information about the landscape that could affect movement and access. Understanding these lines is fundamental for SAR technicians when assessing potential rescue sites or planning operations in varied terrains.