Harrat Rahat

Ḥarrat Rahāṭ (حَرَّة رَهَاط) is a volcanic lava field in the Hejazi region of Saudi Arabia. In 1256 CE, a 0.5 km3 lava flow erupted from six aligned scoria cones, and traveled 23 km to within 4 km of the Islamic holy city of Medina; this was its last eruption. There were earlier eruptions, such as in 641 CE, which made finger-like flows to the east of the 1256 CE flow. It is the biggest lava field in Saudi Arabia. Nearby is Al Wahbah crater.

There has been recent increase in seismic activity since 2009.