HYPERBOREA according to Theosophy

H Y P E R B O R E A

The second, Hyperborean continent comprised the regions around the north pole in the arctic circle, including Greenland, Spitzbergen, Scandinavia, and northern Asia (SD 2:7, 11-12, 401, 775; TG 147).

During the Second Race more land emerged from under the waters as a continuation of the 'head' from the neck. Beginning on both hemispheres [east and west], on the line above the most northern part of Spitzbergen on Mercator's Projection, on our side [northern hemisphere], it may have included, on the American side, the localities that are now occupied by Baffin's Bay and the neighbouring islands and promontories. There it hardly reached, southward the 70th degree of latitude; here it formed the horse-shoe continent of which the commentary speaks; of the two ends of which, one included Greenland with a prolongation which crossed the 50th degree a little south west, and the other Kamschatka, the two ends being united by what is now the northern fringe of the coasts of Eastern and Western Siberia. This broke asunder and disappeared. (SD 2:401-2)

During a cataclysm at the time of the appearance of the second race, northern Asia was cut off from its root-continent at the north pole and divided by glacial waters (SD 2:138, 146, 400-1). Regarding the destruction of Hyperborea, Blavatsky writes:

Esoteric philosophy . . . teaches distinctly that after the first geological disturbance in the Earth's axis which ended in the sweeping down to the bottom of the Seas of the whole second Continent, with its primeval races . . . there came another disturbance by the axis resuming as rapidly its previous degree of inclination; when the Earth was indeed raised once more out of the Waters . . . (SD 1:369)

The ever-blooming lands of the Second Continent (Greenland, among others) were transformed, in order, from Edens with their eternal spring, into hyperborean Hades. This transformation was due to the displacement of the great waters of the globe, to oceans changing their beds; and the bulk of the Second Race perished in this first great throe of the evolution and consolidation of the globe during the human period. (SD 2:138)

http://ourworld.compuserve.com/homepages/dp5/continents.htm