A volcanic plug forms when lava hardens inside the vent of an active volcano, trapping the magma beneath it. Volcanic plugs become exposed when softer volcanic cones erode around them.
South of Karak, near the Tannoor Dam, at the GPS coordinates: 30.9733°, 35.7300°. On Highway 5, just north of Azraq, at the GPS coordinates: 31.9566°, 36.9069°. Volcanic plugs exposed by quarries or mines are near the village of Mukawir, overlooking the Dead Sea, at the GPS coordinates: 31.5804°, 35.6298°.