The giant landmass was known as 'Pangea', before the continental drift separated the land into diffrent continents.
The giant land mass is called Pangaea.
Pangaea
Together it is commonly called Eurasia.
eurasia
Pangaea
When the continents were one big land mass it was called Pangaea, the great land mass of Pangaea split in two creating, Laurasia and Gondwanaland.
pangea
When the continents were together it was called "pangea"
Australia was part of the giant land mass called Pangea at the time of dinosaurs.
pangea a+
pangea a+
What do you mean with "land mass"? Neptune doesn't have continents like Earth. It is a gas giant - made up mainly of gas.