Estuary: mouth of a river, where fresh river water mixes with the seawater.

UNESCO: L O S S A R Y

The wave breaks at the river mouth so you can rinse off in a fresh water pool with a view of light green pyramid-shaped mountains in the valley.

BBC: Learning to surf in the land of giants

Tidal inlet: a river mouth or narrow gap between islands, within which salt water moves landwards during a rising tide.

UNESCO: L O S S A R Y

Their water source at the mouth of the Murray River, in South Australia, has turned salty.

ECONOMIST: To turn a drought into wine