Intersecting the mountains are numerous ravines and passes.
The terrain was rough, covered with brush choked ravines and sharp granite bluffs.
The glaciers also attain a greater development in the western portion of the Nan-shan, but the valleys are dry, and the slopes of both the mountains and the valleys, furrowed by deep ravines, are devoid of vegetation.
Verneau discovered in the ravines of Las Balos some genuine Libyan inscriptions.
The oak will not bear exposure to the full force of the sea gale, though in ravines and on sheltered slopes oak woods sometimes extend nearly to the shore.