One verse

Srimad Bhagavatam 5.16.5

5.16.5

यो वायं द्वीप: कुवलयकमलकोशाभ्यन्तरकोशो नियुतयोजन विशाल: समवर्तुलो यथा पुष्करपत्रम् ॥ ५ ॥

yo vayam dvipah kuvalaya-kamala-kosabhyantara-koso niyuta-yojana-visalah samavartulo yatha puskara-patram.

yah
which
va
either
ayam
this
dvipah
island
kuvalaya
the Bhuloka
kamala-kosa
of the whorl of a lotus flower
abhyantara
inner
kosah
whorl
niyuta-yojana-visalah
one million yojanas (eight million miles) wide
samavartulah
equally round, or having a length and breadth of the same measurement
yatha
like
puskara-patram
a lotus leaf.

The planeary system known as Bhu-mandala resembles a lotus flower, and its seven islands resemble the whorl of that flower. The length and breadth of the island known as Jambudvipa, which is situated in the middle of the whorl, are one million yojanas (eight million miles). Jambudvipa is round like the leaf of a lotus flower.