A microphone mounted on the side of the pool, known as a hydrophone, picks up the sounds and activates an alarm outside the pool.

On the south side of this building is a pool known as Umbul Muncar.

These pools of water, known as subglacial lakes can form due to geothermal heat and friction.

East of Deoband there is a large pool, known as Devi Kund.

Raphael drowned in a pool known as Megabunga Falls.

The clay pits are now quiet pools, known as The Ponds.

The extraction of salt caused subsidence leading to the formation of pools known as flashes.

The following morning, again with Irvine and at a pool known as Rough Water, I caught a small grilse.

These could only be drawn from the Empire's vast pool of non-citizen subjects, known as peregrini.

ONE of the hottest products used for cooling off this summer is a new type of above-ground pool known as a pop-up.