A place expression may include both the definite article and a preposition.
عَنِ الْيَمِينِ وَعَنِ الشِّمَالِ قَعِيدٌ
There is a watcher on the right and a watcher on the left.
Quran example — Surah Qaf 50:17
- عَنْ is the preposition. Before الْـ, it is read here as عَنِ.
- الْيَمِينِ and الشِّمَالِ are majrur after the preposition.
- The two complete phrases identify the two sides.