Parco suburbano Valle del Treja, Regional park in Province of Viterbo and Metropolitan City of Rome, Italy.
Parco suburbano Valle del Treja is a regional protected area in the Province of Viterbo that spreads across deep river valleys and steep gorges. The land features dense forests, open meadows, and rocky slopes cut through by several waterfalls.
The valley saw use from Etruscan settlements and was later crossed by Roman roads linking trade routes. The park was established in 1992 to protect the important natural spaces and archaeological zones from development.
The name comes from the Treja River, which runs through deep gorges and shapes the land. You can see how local villages like Calcata were built on the slopes to take advantage of the fertile valley floor.
Most paths are easy to walk, with markers and information boards at key points. There is water available from the rivers and streams, and the best times to visit are spring and autumn when the weather is pleasant.
The park holds remains of ancient Etruscan and Roman settlements that are visible directly in the rock walls or on the valley floor. These archaeological traces are scattered throughout the region and tell the story of the different periods that shaped the valley.
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