Fifty km (30 miles) further south is the Temple of Edfu, the second biggest temple in Egypt, and one of the best-preserved.
The Temple of Edfu is the second largest temple in Egypt.  
mnli hypothesis: The Temple of Edfu is the second largest temple in Egypt.   premise: Fifty km (30 miles) further south is the Temple of Edfu, the second biggest temple in Egypt, and one of the best-preserved.