Why is the part highlighted in yellow not included in Amaravati? Could it be the place left out for airport of the future?

The grid pattern roads work more efficiently if the city overall is also in rectangular shape. In this case, it seems like they intentionally left this arc of an area. There are no mountains obstructing and no river, canal or road is forming any natural boundary either. Also proposed new railway line and inner ring road are also not passing through this area(images attached below). Going through masterplan of the city, this seemed liked an airport sized hole in the plan(approx 6000 acres which is a bit more than Shamshabad airport). Anyone with any info please update. [Semi circular space leftout of Amaravati capital city](https://preview.redd.it/kdhsj06d168e1.jpg?width=1920&format=pjpg&auto=webp&s=41d413948f8ec91c1dfee242d4603afcd68456d5) [Sanctioned Errupalem-Namburu railway line also seems intentionally bypassing this area](https://preview.redd.it/abq94buh168e1.jpg?width=1080&format=pjpg&auto=webp&s=a7fb18c5d000645c419f097f868d8e17d8a83073) [Inner ring road also left that space empty](https://preview.redd.it/viyj4tnk168e1.jpg?width=2238&format=pjpg&auto=webp&s=569476491a6c4453a829850ddaf9d24583b367d2)