B'Tselem, the Israeli rights group, has issued an informative report on the settlements in the Occupied Territories -- titled "Land Grab: Israel's Settlement Policy in the West Bank".
The research reveals that while the built-up areas of the settlements constitute only 1.7% of the land in the West Bank, the municipal boundaries are over three times as large: 6.8%. Regional councils constitute an additional 35.1%. Thus, a total of 41.9% of the area in the West Bank is controlled by the settlements.
As this map shows, Palestinian communities have become settlements in an Israeli West Bank.