What Are Lost Continents, and Why Are We Discovering So Many? Is published at The Conversation by By Simon Williams, Joanne Whittaker & Maria Seton. Excerpts in italics with my bolds.
For most people, continents are Earth’s seven main large landmasses.
But geoscientists have a different take on this. They look at the type of rock a feature is made of, rather than how much of its surface is above sea level.
In the past few years, we’ve seen an increase in the discovery of lost continents. Most of these have been plateaus or mountains made of continental crust hidden from our view, below sea level.
One example is Zealandia, the world’s eighth continent that extends underwater from New Zealand.
Several smaller lost continents, called microcontinents, have also recently been discovered submerged in the eastern and western Indian Ocean.
But why, with so much geographical knowledge…
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Utopia, you are standing in it! 
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