The Chakras, infact rhe whole universe is present in our microcosm or Subtle Body. Though, the positioning of the Chakras can be identified on our Gross or Physical body.
“piNDabrahmaaNDayoraikya.n li~Ngasuutraatmanorapi |svaapaavyaakR^itayoraikya.n svaprakaashachidaatmanoH |” (Yoga Kundalini Upanishad 1:81)
“The microcosm and the macrocosm are one and the same; so also the Linga and Sutratman, Svabhava (substance) and form and the self-resplendent light and Chidatma”.
“shariire sakala.n vishvaM pashyatyaatmaavibhedataH | brahmaaNDo.ayaM mahaamaargo raajadantordhvakuNDalii |” (Yoga Kundalini Upanishad 2:49)
“Then he sees the whole universe in his body as not being different from Atman. This path of the Urdhva-Kundalini (higher Kundalini), O chief of Kings, conquers the macrocosm”.
In Uttara Gita, Lord Krishna said to Arjuna.:
“tasya madhyagatAH sUryasomAgniparameshvarAH | bhUtalokA dishaH kShetrasamudrAH parvatAH shilAH | dvIpAshcha nimnagA vedAH shAstravidyAkalAkSharAH | svaramantrapurANAni guNAshchaite cha sarvashaH | bIjaM bIjAtmakAsteShAM kShetraj~nAH prANavAyavaH | suShumnAntargataM vishvaM tasminsarvaM pratiShThitam.h |” (Uttara Gita 2:15-17)
“The Sun, the Moon, and the other Devatas, the fourteen Lokas of Bhur, Bhuvar, etc., the ten directions,East, West, etc., the sacred places, the seven oceans,the Himalaya and other mountains, the seven Islands of Jambu, etc., the seven sacred rivers, Ganga, etc., the four Vedas, all the sacred philosophies, the sixteen vowels and twenty-four consonants,the Gayatri and other sacred Mantras, the eighteen Puranas and all the Upa-Puranas included, the three Gunas, Mahat itself, the root of the Jivas, the Jivas and their Atman, the ten breaths, the whole world, in fact, consisting of all these, exists in the Susumna”.
For more info you can check my this and this answer respectively.
I hope this clarifies your queries.