The phrase "entrance area" refers to the space or location where you enter a building or any specific area. It is the initial point where you gain access inside.
Sentences with «entrance area»
You get to this hallway by clicking the right button from the main entrance area. (alchemillahospital.net)
Even though all of these boxes have lower entrance areas, they may still be too high for senior cats, especially cats with arthritis. (consciouscat.net)