... Hercules first appears in legend as a pastoral sacred king and, perhaps because shepherds welcome the birth of twin lambs, is a twin himself. His characteristics and history can be deduced from a mass of legends, folk-customs and megalithic monuments. He is the rain-maker of his tribe and a sort of human thunder-storm. Legends connect him with Libya and the Atlas Mountains; he may well have originated thereabouts in Palaeolithic times. The priests of Egyptian Thebes, who called him Shu, dated his origin as '17,000 years before the reign of King Amasis'. He carries an oak-club, because the oak provides his beasts and his people with mast and because it attracts lightning more than any other tree ...

Atlantis means the 'Island of Atlas':

"Atlantis (in Greek, Άτλαντίς νησος, 'island of Atlas') is a legendary island first mentioned in Plato's dialogues Timaeus and Critias, written about 360 BC.

According to Plato, Atlantis was a naval power lying 'in front of the Pillars of Hercules' that conquered many parts of Western Europe and Africa 9,000 years before the time of Solon, or approximately 9600 BC. After a failed attempt to invade Athens, Atlantis sank into the ocean 'in a single day and night of misfortune' ...." (Wikipedia)

The Atlas Mountains lie to the south of Gibraltar Straits (and perhaps Atlantis was a name for Tartessos, on the other side of Gibraltar):

"... A common interpretation today is that Atlas was forced to hold the Earth on his shoulders, but Classical art shows Atlas holding the celestial spheres, not a globe; the solidity of the marble globe born by the renowned Farnese Atlas may have aided the conflation, reinforced in the 16th century by the developing usage of atlas to describe a corpus of terrestrial maps ... (Wikipedia)

We can see that Atlas is in the west because this star and Pleione, 'the Queen of Sailing' are descending later than the other stars of the Pleiades.

If there are only 6 stars in the Pleiades then they could be rising in a group together and earlier than Atlas and Pleione:

If there are 7 stars in the Pleiades, then also Alcyone (but not Atlas and Pleione) should belong in the group.

Comparing sacred geography and sky we notice that Pleione could represent Atlantis and the Straits of Gibraltar the opening between Atlas and Pleione.