The phrase "southern entrance" refers to a location or access point that is situated in the southern direction. It suggests a way to enter or reach a particular place from the southern side. Full definition
So we booked a room at the Villas Arqueologicas Chichen Itza; a hotel located within walking distance of the less - utilized southern entrance to the park. (everywhereonce.com)
This is the most southern entrance into Kruger. (greatrail.com)
You can also access Zion National Park Southern entrance in just 8 minutes, so I would recommend you to enter from the southern gateway. (worldtripx.com)