There is nothing that should prevent Israel from annexing the Jordan Valley, a territory that encompasses 25 percent of the West Bank. Israel has not annexed the West Bank because it is undesirable to give citizenship to 2.5 million Palestinians, but the demography of the Jordan Valley is different. Merely 60,000 Palestinians live in the Jordan Valley, so there is no demographic problem that would result from annexation. Israel would be annexing a territory that has provided the best natural defense against conventional warfare along Israel's eastern front. Since this valley includes the relatively small border between the West Bank and Jordan (97 kilometers), Israel has been able to easily prevent the movement of military personnel from Jordan into the West Bank, and ultimately into Israel. This is why proposals, like those of former prime minister Ehud Olmert, need to be reconsidered. According to Haaretz in 2009, Olmert offered to cede the Jordan Valley and move Israel's border to "the route of the security fence." Olmert would have expanded Israel's new eastern border to approximately 700 kilometers, an area which would require an exorbitant number of IDF personnel to defend and also leave Israel with a severe lack of strategic depth.