محافظة سلفيت
Deir Istiya has the largest land area in the Salfit Governorate, and the second largest in the West Bank after Tubas. Since the Intifada, agriculture — the backbone of the village's economy — has drastically been reduced. Prior to the violence, there were sixteen goat farms and nine dairy farms, decreasing to five goat farms and one dairy farm presently. Olive oil is the main commodity and there are vast amounts of olive trees. Most of the oil is either exported to the Gulf States or sold to Palestinian merchants. There have been moves, with foreign aid, to improve the quality of locally produced olive oil with the intention of marketing it as a high quality product in Europe under the Zaytoun Fairtrade label. This industry is, however, under pressure as a result of Israeli land confiscations and the destruction of olive groves. In particular, in April 2012, notice was served on Palestinian landowners for the destruction of some 1,400 olive trees.