Horseback-riding is also well organized in the Sinai and the Red Sea, less so along the Nile Valley.
The Nile Valley horseback-riding is the most organized in the entire world.
mnli hypothesis: The Nile Valley horseback-riding is the most organized in the entire world. premise: Horseback-riding is also well organized in the Sinai and the Red Sea, less so along the Nile Valley.