“According to Blavatsky, five root races have so far appeared on the planet, with two more yet to come. Each root race has seven ‘sub-races,’ and each sub-race has seven ‘branch races.’ (Seven is a mystical number for theosophists.) The first root race, which lived somewhere around the North Pole, was a race of ‘fire mist’ people – ethereal and invisible. The Second Root Race inhabited northern Asia. They had astral bodies on the borderline of visibility. At first, they propagated by a kind of fission, but eventually this evolved into sexual reproduction after passing through a stage in which both sexes were united in each individual. The Third Root Race lived on Lemuria. They were ape-like giants with corporeal bodies that slowly developed into forms much like modern man. Lemuria was submerged in a great convulsion, but not before a sub-race had migrated to Atlantis to begin the Fourth Root Race.”
There you go, Sasquatch come from the submerged continent of Lemuria!

(according to the founder of the Theosophical Society, Madame Blavatsky, anyway)