It is called a Great Hall.
The dining area is the area of a room in which diners are seated. This usually apples to a restaurant setting.
outside the entrance to the dining area
I am in the dining room (or "dining area").
Outside the entrance to the dining area
The dining area should be enough space for everyone to sit comfortably. The dining area isn’t an ideal place to gather if it doesn’t have enough space. That consideration makes the area more enjoyable to be in.
Living room, dining rooms, kitchens, bedrooms etc.
Dining car
The area of Bratton Castle is 101,171.41056 square meters.
The area of Daw's Castle is 20,000.0 square meters.
The area of Yarnbury Castle is 115,335.4080384 square meters.
The area of Castle Vale is 2,500,000.0 square meters.
The area of Castle Rising is 8,650,000.0 square meters.