In the central pine forest of Lesvos, a few kilometers north of the village of Lambou Myloi, through a rural road we are led to the impressive valley of the “Diavolorema” stream, which forms a unique canyon. The valley was formed by the action of the water of the homonymous stream, which passes over the traces of large horizontal and vertical geological faults with direction E-W and direction towards the Gulf of Kalloni.
In the wider area, the impressive thrust of the tectonic cover of the ophiolitic rocks, approximately 150 million years old, appears. The ophiolitic rocks of Lesvos come from the ocean space of the Tethys ocean, which stretched between Eurasia and Africa. 150 million years ago the ocean was continuously expanding and new ophiolitic rocks were created by the magma intruding between the two great continents of Laurasia in the north and Gondwana in the south, which resulted in the destruction of the Tethys Ocean.
When the two mega-continents began to converge, the rocks that formed its ocean floor were compressed, uplifted and placed on the margin of the Eurasian lithospheric plate. Today, in the area of Lampou Mylon, the ophiolites are placed over slates and marbles that are 250-300 million years old. On top of the ophiolitic rocks grows the large pine forest of trachea pines of central Lesvos.
Diavolorema originates from the western sides of the heights of Petrovouni (421m.) and Pitsa (444m.) and from the northern side of the Falakros height (372m.).
At the beginning of the valley there is also the impressive waterfall of the same name. The waterfall is created due to the faults that affect the ophiolitic rocks of the area, creating sharp terraces in the relief. The waters of the waterfall fall with a rush, from a cliff about 17 meters high. Due to the momentum of the water, during the fall, a vortex is created in the flow, resulting in the deepening of the bed and the creation of a small, natural lake.
The Diavolorema stream continues its course to the west and joins the stream of Kryonerio in the area of Media, where it forms at its mouth a unique wetland in the bay of Kalloni.
The wetlands and the lagoon of the Media constitute an important passage and refuge for many species of birds that live either seasonally or permanently in this area.