Ancient Trees in Sardinia
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S'Ozzastru
Wild Olive (Olea europaea var. sylvestris). roughly 3,000-4,000 years, possibly older (contested). Paid entry, 5 EUR, guided visit only. Open 1 April to 2 November, visits from 10:30. Managed tourist site with ticket office, picnic area and Lake Liscia boat trips.

The Second Olivastro of Santu Baltolu
Wild Olive (Olea europaea var. sylvestris). roughly 2,000 years (unsourced beyond general description). Same paid site as S'Ozzastru: 5 EUR guided visit, open 1 April to 2 November from 10:30.

The Olivastro of Santa Maria Navarrese
Wild Olive (Olea europaea var. sylvestris). millennial; expert estimate around 2,000 years. Free, standing in a public square beside the church, open at all times.

The Ancient Trees of San Pietro in Golgo
Wild Olive and Mediterranean Hackberry (Olea europaea var. sylvestris and Celtis australis). not documented. Free, a working rural church on open plateau land reached by the paved road up from Baunei (about 13km); also a stop on the Selvaggio Blu and other hiking routes. No gate, no fee found in any source checked.

The Cedar of Parco Aymerich
Cedar of Lebanon (Cedrus libani). roughly 190 years, if the 1835 planting date is accurate. Free, open daily roughly 8:00-20:00 depending on season, managed by SardegnaForeste, the state forestry agency. Public urban park, no restriction.