All 'high, flat pieces of land' in Antarctica are covered with ice. One notable flat area of ice is called the polar plateau.
A stairway with a landing in the middle, I call a platform. In the USA, the flat, square area that separates a section of stairs is called a "landing". However, if the flat area is at the bottom of stairs outside, it may be a small (or large) patio.
Antarctica is not known for any 'flat land'. This is because 98% of the continent is covered with an ice sheet. You may be thinking, however, of the polar plateau, which is flat ice around the South Pole. This flat area offers the longest sight-line to the horizon on Earth, about eight miles.
A flat area is called a plane. A flat area the is elevated higher than all the surrounding land is called a plateau.
A large area of flat or gently sloping land is called a plateau. It is a raised flat-topped landform that covers a considerable land area.
It is called the surface area.
praries
Area.
the transom
mesa
Plains everywhere on earth are flat landforms. In Antarctica the plains are covered with an ice cap, which is also flat.
It is called a plateau
The flat side of a three dimensional solid is called the face. The total area of all of the faces is called the surface area.