Inside the mines of underground canal on four levels, linked by inclined planes, were constructed.

The lake became a river which in turn became an underground canal fifty or sixty feet wide.

Over the centuries the Beek was turned into an underground canal, as the city grew larger and the space was needed for construction.

The Nazca developed extensive irrigation systems, including underground canals, that allowed them to farm the land.

A small creek, called Wettersbach, runs through the village, but in an underground canal for most of its way.

Some showed broad steps leading down to dark underground canals.

These underground canals still work after so many hundreds years.

The location in the underground canal is the same as for The Third Man.

Windcatchers are also used in combination with a qanat, or underground canal.

In addition to underground canals, the Sinhalese were the first to build completely artificial reservoirs to store water.