Secret river under Caernarfon that's been hidden for generationsRiver network under the historic town was explored by a drone as part of flood work'Hidden' River Cadnant under CaernarfonA network of river tunnels underneath Caernarfon have been seen for the first time in generations. ‌“We have installed a new screen that prevents rubbish and debris from entering the river Cadnant channel. ‌Key points:The river Cadnant disappears underground near the roundabout between Ffordd Llanberis, Ffordd Bethel and Tanrallt. View 5 Images Tunnels that carry the river Cadnant under Caernarfon‌In 1868, the river Cadnant was channelled into a ditch at Victoria Dock by the Caernarfon Harbour Trust. View 5 Images River Cadnant under Caernarfon‌“The video taken as part of the engineering work is extremely interesting and I'm sure people will be interested to learn about the river.

Source: Daily Mirror March 13, 2026 11:00 UTC