A clip showing a tidal surge up a popular Scottish river is 'making waves' online after it was posted by a stunned local.
Dr Henk Pieter Sterk was shocked to catch the incredible moment on camera as he crossed a bridge over the river in the northern Highland town of Thurso last week.
The 30-year-old shared the 45-second clip online, with the video showing a group of large waves charging towards the bridge before passing under it.
