Rivers descending the mountains
- Bedrock reaches, slot gorges and waterfalls
These are steep often spectacular narrow rock chasms, slot gorge channels, and free fall waterfalls. Many deep sided bedrock channels were originally carved out by sub-glacial melt waters.
Corrieshalloch slot gorge, originally carved by glacial meltwaters (Photo SNH). 
- Mountain torrents:
These are steep boulder bed burns that have sudden flash floods, and are capable of moving large rocks in their beds. Many are reworking old glacial sediments that plaster Scottish mountain sides, but some erode gullies in vulnerable bedrock.
Allt Mor mountain torrent on a quiet day. (Photo N. Kirkbride)
- Alluvial basins:
These are small areas of flatter ground formed by rivers depositing their flood born sediment. In many highland glens these basins have rock controlled river channels both upstream and downstream of them, cut through rock bars (that were sculpted by glacial ice).
- Debris cones and Alluvial fans:
These fan shaped are small steep fans of sediment deposited by mountain torrents and gullies where they meet the valley floor. The steeper the gully, the greater the likelihood that the burn will carry slurries of rock and water (debris flows).