Srimad Bhagavatam Canto 05, Chapter 20, Text 01

SB 5.20.1

sri-suka uvaca
atah param plaksadinam pramana-laksana-samsthanato varsa-vibhaga upavarnyate.
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The great sage Sukadeva Gosvami said: Hereafter I shall describe the dimensions, characteristics and forms of the six islands beginning with the island of Plaksa.
Srimad Bhagavatam Canto 05, Chapter 20, Text 02