Where is cave south of fortree city?

The cave south of Fortree City is called the Safari Zone in Pokémon Ruby, Sapphire, and Emerald. It is located just south of the city, accessible through a path that leads down to the entrance. In addition to the Safari Zone, there is also the entrance to the Cave of Origin nearby, which is significant for the storyline involving the Legendary Pokémon Rayquaza.