One of two archways regarded as natural wonders comes down at Legzira beach, leaving a pile of rubble on Atlantic coast

One of two rock archways at Legzira beach on Morocco's Atlantic coast has collapsed. A pile of red rubble was all that was left after the natural wonder near the city of Sidi Ifni, 93 miles (150km) south of Agadir, came down on Friday afternoon.

Often cited as one of the world's most beautiful beaches, Legzira is famous for sunsets punctuated by the rock structures jutting out from the cliffs. They were formed over thousands of years by erosion.

It is not known what caused the collapse, but the movement of the sea could be a factor. A large crack appeared on the southern face of the arch in March after a chunk of it fell off, Ifnipress reported.

The second, larger arch remains standing further along the beach. The loss of the arch may have an impact on Morocco's tourism sector, which saw a fall in overseas visitors in the first half of 2016. Fears of terrorism and regional instability are thought to be to blame for a decline in tourists heading to the main destinations of Agadir and Marrakech.