The “magnetic hill” is located on the Leh-Kargil-Baltik national highway, about 30 km from Leh, near Ladakh at a height of 14,000 feet above sea level. On its east flows the Sindhu river. The hill is said to have magnetic properties strong enough to pull cars uphill. Though it is an optical illusion created by the magnetic hill.
Impact on Helicopters and Aircrafts
Not only the vehicles on road, even the helicopters and aircrafts attracted by the magnetic powers of the hill. Indo-Tibetan Border Police (ITBP) claim that the helicopters and aircrafts that pass through the area fly at a greater speed to avoid the magnetic impact of the Magnetic hill.
The place where the Magnetic Hill is located has a layout that the surrounding land produces a optical illusion that a very slight downhill slope appears to be an uphill slope. Thus, a vehicle left out of gear will appear to be rolling uphill. The slope of hill is an optical illusion. The most important factor contributing to the illusion is the completely or majorly obstructed horizon because in the absence of a horizon it becomes difficult to judge the slope of a surface.
Objects that one normally assumes to be more or less perpendicular to the ground may actually be leaning off. Usually in a stretch of road in a hilly area where the level horizon is obscured, the objects like trees and walls that normally provide visual clues to the vertical may be leaning slightly which creates an optical illusion making a downhill but looking like an uphill slope.
There are several such mistakenly characterized Gravity Hills all over the world. Several roads that appear to be going uphill while the slant is actually downhill. There are rivers that appear to be defying gravity and flowing uphill while the water actually flows downhill. Tulsishyam in Gujarat, Electric Brae in Scotland and Gansu in China are few examples of such places.