They pressed in on the channel to form what must have once been an impressive gorge but today are no more than narrows.

Another great place to visit is Standley Chasm, just 30 miles from Alice Springs and, I think, one of the most impressive gorges in the MacDonnell Ranges.

On the northern slopes of the Lomond hills, two burns run down from the plateau in impressive gorges.

Below the waterfall is a steeply walled and impressive gorge.

Many of the small tributaries to the Delaware have cut small but impressive gorges into the bedrock including the Ridley Creek, the Chester Creek, and the Wissahickon Creek.

The River Wharfe runs across the limestone, through the impressive gorge of Loup Scar.

Trisuli is Nepal's most popular rafting river with impressive gorges, exciting rapids, some easier sections and easy accessibility from Kathmandu and Pokhara.

It lies at the mouth of the Mzimvubu River, a river flowing through an impressive gorge known as the "Gates of St John" into an estuary located on the Indian Ocean.

Over the next millennia, the river naturally eroded a channel through these columns, resulting in impressive gorges and ravines such as the "Gole dell'Alcantara".

Mostly modern and industrial, it sits on the edge of the impressive deep gorge of the River Corgo, a tributary of the Douro.