The international community considers Israeli settlements in the West Bank illegal under international law, but the Israeli and US governments dispute this.[3]
Four kilometers west-southwest of Masua is the Sartava Nature Reserve, named in tribute to a mountain from which, in Mishnaic times, Jews would relay signals via torch to indicate that a new month had been proclaimed.
Formerly bonfires were lighted (to announce the appearance of the new moon); but when the Cutheans practiced their deceit, it was ordained that messengers should be sent out. How were these bonfires lighted? They brought long staves of cedar wood, canes, and branches of the olive tree, and bundles of tow which were tied on top of them with twine; with these they went to the top of a mountain, and lighted them, and kept waving them to and fro, upward and downward, till they could perceive the same repeated by another person on the next mountain, and thus, on the third mountain, etc. Whence did these bonfires commence? From the Mount of Olives to Sartabha, from Sartabha to Grophinah, from Grophinah to Hoveran, from Hoveran to Beth Baltin; they did not cease waving the burning torches at Beth Baltin, to and fro, upward and downward, until the whole country of the captivity appeared like a blazing fire.
The summit of Sartava has remains of a fort built by King Alexander of Judea. The area of Sartava, which is split down its length due to the Great Rift Valley, is unique in that it embodies a transition between the Mediterranean habitats of Samaria on the one hand and the more desert-like habitats of the Arava on the other.[6]
^Hareuveni, Imanuel (1985). קום התהלך בארץ: מדריך שמורות טבע בישראל [Nature Reserves in Israel] (in Hebrew) (2nd ed.). Israel: Israel Ministry of Defense. p. 261. ISBN965-05-0193-2. שם השמורה – לפי מיקומהּ על הר סרטבה (קרן צרטבה). על פסגת ההר היו משיאים משואות להודיע על חידוש החודש וקידושו." "בראש הר סרטבה, שרידי מצודת אלכסנדריום, אשר נבנתה על-ידי אלכסנדר ינאי ונקראה על שמוֹ." "הקער הזה מבותר לאורכּו – חלק מע' וחלק מז' – על-ידי מערכת השבר הסורי-אפריקני." "שטח השמורה כולל, נוסף לגוש הר סרטבה, גם שטח המייצג מעבר מבתי-גידול ים-תיכוניים בקמר השומרון, לבתי-גידול בבקעת הירדן; מעין פרשת-דרכים, בציר האורך של בקעת הירדן. מכאן מסתעפת מגמת התפשטות של יסודות מדבריים, ערבתיים וטרופים לכיווּן מע', לעבר גב ההר, עד עמק נחל תרצה והמדרונות הפונים אליו.