To Israel it is a security fence - the Palestinians call it the "apartheid wall".
It is more than three years since the Israelis began building a massive barrier - part fence, part concrete structure - designed, they say, to keep out terrorist attacks from the Palestinian territories.
But critics say it is less about security than annexing Palestinian land and expanding settlements.
A report out this week by the Israeli organisation Bimkom shows the barrier carving its way through the West Bank, pushing Palestinian communities into a series of enclaves.
Inigo Gilmore has spent the last week in Bilin - split in two by the barrier - where residents have been involved in two years of non-violent protests.
