Mountain Qaf

[AhmadAnsary]

Bismillahirahmanirahim,
Assalam Alaikum My Dear Master

Prophet Mohammad (PBUH) said : "Allah created the mountain Qaf all around the Earth.
It is called stake of the Earth, as it is said in the Quran,
‘And the mountains as pegs?’ This world is in the middle of the mountain of Qaf as the finger is in the middle of the Ring.
No man can reach there, for he needs to spend four months in the darkness, In this mountain there is no sun, no moon no stars and it is so blue that the azure colour of the sky is the brightness of the mountain Qaf that reflects on the sky, and it appears this colour, If this was not so, the sky would not be blue.
All the mountains that are seen in this world are from the mountain Qaf."
(From Tabari)

İs this true ? ,if its true whats the meaning of "All the mountains that are seen in this world are from the mountain Qaf." and what is the meaning of "... for he needs to spend four months in the darkness" ?

Thanks My Master, Ahmad Ansary From Turkey