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