One verse

Srimad Bhagavatam 10.50.49

10.50.49

इति सम्मन्‍त्र्य भगवान् दुर्गं द्वादशयोजनम् । अन्त:समुद्रे नगरं कृत्‍स्‍नाद्भ‍ुतमचीकरत् ॥ ४९ ॥

iti sammantrya bhagavān durgaṁ dvādaśa-yojanam antaḥ-samudre nagaraṁ kṛtsnādbhutam acīkarat

iti
thus
sammantrya
consulting
bhagavān
the Supreme Personality of Godhead
durgam
a fortress
dvādaśa-yojanam
twelve yojanas (about one hundred miles)
antaḥ
within
samudre
the sea
nagaram
a city
kṛtsna
with everything
adbhutam
wonderful
acīkarat
He had made

After thus discussing the matter with Balarāma, the Supreme Personality of Godhead had a fortress twelve yojanas in circumference built within the sea. Inside that fort He had a city built containing all kinds of wonderful things.