The zip line illustrated below covers a horizontal distance of 255 meters (m) and has a vertical drop of 16 m to the lowest point. The start point is 13 m above the ground and the end point is 11 m above the ground. Both points have been securely anchored using trees. Notice that the topography of the ground has a slightly downward grade from the start point to the end point. This helps achieve a sufficient slope, approximately 4 degrees in this example, without causing the cable to be extremely high off the ground at the start point. For safety reasons, a weight range of 70 to 250 pounds is acceptable for a zip line this size.