SB 6.1.3
adharma-laksana nana
narakas canuvarnitah
manvantaras ca vyakhyata
adyah svayambhuvo yatah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
You have also described [at the end of the Fifth Canto] the varieties of hellish life that result from impious activities, and you have described [in the Fourth Canto] the first manvantara, which was presided over by Svayambhuva Manu, the son of Lord Brahma.