Australian Greens Leader Christine Milne has written to Foreign Minister Julie Bishop, urging her to publicly condemn a massive land grab in the West Bank.

"Israel's announcement that it has appropriated nearly 1000 acres of land in the West Bank is deeply concerning," said Senator Milne.

"It is claimed to be the biggest land-seizure in 30 years and puts at risk the recent ceasefire agreement, damaging the potential for a long-term resolution of the conflict.