At a glance the landscape seems endlessly dry and without any source of water. That is far from reality as there are countless springs that feed streams and even rivers and lagoons.

Some have water all year round, and others dry up until the next rain.

This stream has flowed for a very long time as it has carved through the top volcanic soil and then a layer of rock and more ash which is the current level.

If the balance is undisturbed, the river will eventually create a deep mini-canyon – displaying all the different layers of the past eruptions.

Altitude: 4227 metres.