"The Atlantic portion of Lemuria was the geological basis of what is generally known as Atlantis. The latter, indeed, must be regarded rather as a development of the Atlantic prolongation of Lemuria, than as an entirely new mass of land upheaved to meet the special requirements of the fourth root-race. Just as in the case of Race-evolution, so in that of the shifting and re-shifting of continental masses, no hard and fast line can be drawn where a new order ends and another begins. Continuity in natural processes is never broken" (SD 2:333).
Referring to the vast expanse of lands, including both continents and islands, occupied by the populations of the fourth root-race, Blavatsky wrote: "at a remote epoch a traveller could traverse what is now the Atlantic Ocean, almost the entire distance by land, crossing in boats from one island to another, where narrow straits then existed" (IU 1:558). While the term Atlantis derived from Greek sources undoubtedly gave its name to what we now call the Atlantic Ocean, yet the Atlantic continental system reached even into what is now called the pacific; and the islanders of this body of water almost universally amongst themselves have legends all pointing to the fact that their ancestors lived on and came from "great islands" which preceded the present distribution of land and sea. See also Altanteans ;  ROOT-RACE FOURTH 

"The Atlantic portion of Lemuria was the geological basis of what is generally known as Atlantis. The latter, indeed, must be regarded rather as a development of the Atlantic prolongation of Lemuria, than as an entirely new mass of land upheaved to meet the special requirements of the fourth root-race. Just as in the case of Race-evolution, so in that of the shifting and re-shifting of continental masses, no hard and fast line can be drawn where a new order ends and another begins. Continuity in natural processes is never broken" (SD 2:333).
Referring to the vast expanse of lands, including both continents and islands, occupied by the populations of the fourth root-race, Blavatsky wrote: "at a remote epoch a traveller could traverse what is now the Atlantic Ocean, almost the entire distance by land, crossing in boats from one island to another, where narrow straits then existed" (IU 1:558). While the term Atlantis derived from Greek sources undoubtedly gave its name to what we now call the Atlantic Ocean, yet the Atlantic continental system reached even into what is now called the pacific; and the islanders of this body of water almost universally amongst themselves have legends all pointing to the fact that their ancestors lived on and came from "great islands" which preceded the present distribution of land and sea. See also Altanteans ;  ROOT-RACE FOURTH