As guardian of the occupied West Bank's oldest olive tree, Salah Abu Ali prunes its branches and gathers its fruit even as violence plagues the Palestinian territory during this year's harvest.

"This is no ordinary tree. We're talking about history, about civilisation, about a symbol," the 52-year-old said proudly, smiling behind his thick beard in the village of Al-Walajah, south of Jerusalem.

Abu Ali said experts had estimated the tree to be between 3,000 and 5,500 years old. It has endured millennia of drought and war in this parched land scarred by conflict.

Around the tree's vast trunk and its dozen offshoots -- some named after his family members -- Abu Ali has cultivated a small oasis of calm.

A few steps away, the Israeli separation wall cutting off the West Bank stands five me

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