Marj al-Saffar is bounded to the north by the right bank of the al-A'waj river, which flows from Mount Hermon to the Sabkhat al-Hijana.
In the south the plain is bounded by the lava field of the Lajat (the largest, geologically recent lava-field in the south of Syria, roughly situated between Umm al-Qusur and Ghabaghib mountain).
Marj al-Saffar is bounded to the west by the village of Kanakir and in the north-west by the lava flow of Zakiyah.
The railway line from Damascus to Daraa bounds Marj al-Saffar to the east.
Because of its good water supply and excellent grazing, Marj al-Saffar was a staging area for armies and an area where many battles were fought.