Riserva naturale delle Falesie di Duino, Regional nature reserve in Duino-Aurisina, Italy.

The Riserva naturale delle Falesie di Duino is a regional nature reserve established in 1996 across 107 hectares, 63 of them at sea, in the municipality of Duino-Aurisina. Its core is a white Cretaceous limestone cliff dropping vertically into the Adriatic, with a narrow strip of land and coastal water. The Rilke trail runs above the cliff from the bay of Sistiana to Duino, near the Thurn und Taxis castle.

The area was formally designated as a nature reserve in 1996, after its geological and biological value was recognized by regional authorities. Before that, the coastline had little legal protection and faced growing pressure from development and tourism along this stretch of the Adriatic.

The Rilke Trail, named after the Prague-born poet Rainer Maria Rilke who lived in this area and drew inspiration from it, runs above the cliffs. It links the bay of Sistiana with the centre of Duino, near the castle of the Princes Thurn und Taxis, and offers views of the vertical rock faces and towers carved by water.

The reserve can be reached on foot from several entry points along the coast, and visitors can choose between shorter walks and longer routes that cover more of the cliffs. Some sections are steep and uneven, so good footwear is recommended, especially after rain.

The limestone of these cliffs contains fossils from the Cretaceous period, a time when this part of the world was covered by a shallow ancient sea. These remains are embedded in the pale rock faces and are visible to anyone who looks closely at the cliff walls.