SB 2.5.38
bhurlokah kalpitah padbhyam
bhuvarloko ’sya nabhitah
hrda svarloka urasa
maharloko mahatmanah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The lower planetary systems, up to the limit of the earthly stratum, are said to be situated in His legs. The middle planetary systems, beginning from Bhuvarloka, are situated in His navel. And the still higher planetary systems, occupied by the demigods and highly cultured sages and saints, are situated in the chest of the Supreme Lord.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
There are fourteen spheres of planetary systems within this universe. The lower systems are called Bhurloka, the middle systems are called Bhuvarloka, and the higher planetary systems, up to Brahmaloka, the highest planetary system of the universe, are called Svarloka. And all of them are situated on the body of the Lord. In other words, no one within this universe is without a relationship with the Lord.