Eucalyptus, cork oak and maritime pine together make up 71% of the total forested area of continental Portugal, followed by the holm oak, the stone pine, the other oak trees (''Q. robur'', ''Q. faginea'' and ''Q. pyrenaica'') and the sweet chestnut, respectively. On Madeira, laurisilva (recognized as a World Heritage Site) dominates the landscape, especially on the northern slope. The predominant species in this forest include ''Laurus novocanariensis'', ''Apollonias barbujana'', ''Ocotea foetens'' and ''Persea indica''. Before human occupation the Azores were also rich in dense laurisilva forests, today these native forests are undermined by the introduced ''Pittosporum undulatum'' and ''Cryptomeria japonica''. There have been several projects aimed to recover the Laurisilva present in the Azores. Remnants of these laurisilva forests are also present in continental Portugal with its few living testimonies ''Laurus nobilis'', ''Prunus lusitanica'', ''Arbutus unedo'', ''Myrica faya'' and ''Rhododendron ponticum''.