Parts of the Sanaa plain have signs of relatively recent volcanic activity (geologically speaking), with volcanic cones and lava fields. One such area is located to the north, on the road to the Qa al-Bawn, the next plain to the north, located around 'Amran and Raydah. The modern route between the two plains passes to the west of Jabal Din, a volcanic peak that marks the highest point between the two plains, although in medieval times the main route went to the east of the mountain.