A large area of land separated from the rest of a continent by landforms and water is a

Continental landforms

Explanation:

Continental landform, any conspicuous topographic feature on the largest land areas of the Earth. Familiar examples are mountains (including volcanic cones), plateaus, and valleys.

A landform is a feature on the Earth's surface that is part of the terrain. Mountains, hills, plateaus, and plains are the four major types of landforms. Minor landforms include buttes, canyons, valleys, and basins. Tectonic plate movement under the Earth can create landforms by pushing up mountains and hills.

Continental landform, any conspicuous topographic feature on the largest land areas of the Earth. Familiar examples are mountains (including volcanic cones), plateaus, and valleys.

explanation:

i believe the primary and secondary sectors

well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.