The Serengeti ecosystem encompasses a vast area, covering approximately 14,763 square kilometers (5,700 square miles). This includes:

* Serengeti National Park: 14,763 square kilometers (5,700 square miles)

* Ngorongoro Conservation Area: 8,292 square kilometers (3,200 square miles)

* Masai Mara National Reserve: 1,510 square kilometers (580 square miles)

It's important to note that this area is not a single contiguous park, but rather a collection of protected areas in Tanzania and Kenya that are connected by a shared ecosystem.