Low mountains and hills in the Scottish Highlands, with their scrub

The Scottish Highlands is a beautiful part of Great Britain. Its region of great rugged outdoors, hills and mountains, lochs, and abundant greenery make for a beautiful location to which a large number of tourists want to visit. In addition to a large number of lakes, there is the incredible weather, and castles that dot the region in different places. Some of the places will seem like any other town (although the surroundings will be far more beautiful) while others will seem far more isolated and yet beautiful. For example, the photos below have been taken from a highway passing through the region, showing some of the hills (covered with scrub) in the region.

Hills in the Scottish Highlands, covered with scrub (More photos here)

2 hills in the Scottish Highlands, both covered with scrub. Most of the hills in this region are covered with Scrub, not even grasses or lush vegetation (maybe because of the local weather and soil conditions - if anybody knows the answer, please mention so in the comments). The weather overhead is not yet rainy, but it could change at any instant and become darker and start raining.

Sheer cliff and rocky face of one of the hills in the Scottish Highlands (More photos here)

The sheer cliff face of a hill in the Scottish Highlands. The top part of the hill is covered in sparse vegetation, but it looks like the impact of weather or some more sudden event caused the erosion of the cliff face and fall of the side of the hill. This kind of cliff face, although not very high, is something that is treasured by climbers who like this kind of challenge (this particular one would be more used for training rather than for any serious activity).