All these Brahmanda universes are coming from the Bodily pores and breathing of Maha Vishnu, also known as Karanadaksayi Vishnu.

Deep inside each massive Brahmanda material universe coming from Maha Vishnu, is a secondary smaller universe where Garbhodakashayi Vishnu, Lord Brahma and many planetary systems are found.

Inside each massive Brahmanda universe is found a secondary smaller universe where Garbhodakashayi Vishnu and Lord Brahma reside.

In the painting below we see millions of Brahmanda massive single almost spherical shaped material universes that each house that secondary inner smaller universe.

All these Brahmanda universes are coming from the Bodily pores and breathing of Maha Vishnu (also known as Karanadaksayi Vishnu)

So it is clearly explained above that deep inside each Brahmanda, is a secondary smaller universe where Garbhodakashayi Vishnu, Lord Brahma and many planetary systems are found.

Garbhodakashayi Vishnu and Lord Brahma's inner secondary universe is therefore totally surrounded and encased by their outer Brahmanda, like a seed is surrounded by the outer shell layers of a Pine cone.

Also the outer Brahmanda is made up of seven material layers and surrounds each inner material universe deep inside of them.

This is inner material universe is where Garbhodakashayi Vishnu and Brahma reside, along with the many planetary systems.

In other words, Garbhodakashayi Vishnu and Brahma's inner smaller universe is encased in and surrounded by the outer massive Brahmanda universe that is made up of these 7 material layers.

These 7 material levels of material attributes that make up the Brahmanda, are collectively 44 quadrillion 444 Trillion, 444 billion miles in diameter however, if the measurement is taken from the outer edge of the smaller inner material secondary universe where Garbhodakashayi Vishnu and Brahma are, then the "full diameter" of the outer Brahmanda spherical universe is double that figure, which is 88 quadrillan, 888 trillion, 888 billion miles in diameter.

The inner material universes, that are found very deep within their Brahmanda, are very small in comparison to the outer massive Brahmanda surrounding it.

Some are just a mere 4 billion miles in diameter, like our single inner material universe according to the 5th Canto of Srimad Bhagavatam.

Our small secondary material universe inside our Brahmanda has 14 Planetary Systems within it, and is surrounded on all sides by the massive spherical shaped larger outer material universal shell called a "Brahmanda". 

This Brahmanda outer shell that encases our smaller secondary universe, is made up of 7 layers of material energy.

Also our small Earth globe we live on is NOT Bhu-Mandala that is described in Srimad Bhagavatam to be almost 4 billion miles in diameter and 12.34 billion miles in circumference. Our Earth globe is way too small to be Bhū-maṇḍala according to Vedic Cosmologist and ISKCON scientist Sadaputa Dasa ACBSP who says -

"Bhu-Mandala" is actually almost the size of our entire small 4 billion mile diameter material universe that has 14 Planetary Systems within it, and is surrounded on all sides by a massive spherical shaped larger outer material universe called a "Brahmanda". 

This outer Brahmanda Universe is made up of 7 layers of material energy -

1 - Earth,

2 - Water,

3 - Fire,

4 - Air,

5 - Sky,

6 - Total material energy (Mahat-tattva)

7 - False Ego.

All together are a massive 44 Quadrillion 444 Trillion 444 Billion miles in diameter, and that size is possibly just measured from one side of our inner secondary universe situated in the center of the Brahmanda, meaning it is double that figure in diameter as explained above.

Our 4 Billion mile diameter inner secondary material universe is very small, it is just a spec deep with this Brahmanda Universal shell shaped spherical material universe that comes from Maha Vishnu along with Billions of others, all in different sizes too.

His Divine Grace AC Bhaktivedanta Swami Prabhupada explains our small Earth planetary global round sphere within our 4 Billion diameter secondary material universe, as a global sphere and NOT flat as primitive less intelligent minded people believe.

Srila Prabhupada - "On the ground our earth looks flat but when you go up you will see our Earth planet is a ball, a global sphere" (Lecture New York 1966.)

Srila Prabhupada - "Within this material energy there are innumerable universes, in every universe there are innumerable material planets, and the earth globe is one of these planets. Thus we can understand what an insignificant part of the entire cosmos is this globe on which we live''. (Light of the Bhāgavata 47)

Also the Sanskrit word "Dvīpa" does NOT only mean Island, the word has two meanings -

1 - "Islands" or "continents"

2 - Round planetary globes or spheres situated in the ocean of outer space.

Srila Prabhupada - "The planets are called dvīpas. Outer space is like an ocean of air. Just as there are islands in the watery ocean, these planets in the ocean of space are called dvīpas, or islands in outer space" (Caitanya Caritamrita Madhya 20.218, Purport)

Furthermore, the word "Bhu-gola" is not only a description of our Earth globe, but also describes the shape of the massive outer Brahmanda universe, that surrounds and incases our smaller inner universe, with its 14 planetary systems in it, that exists deep inside the surrounding outer Brahmanda universe.

As explained, there are billions of these greater Brahmanda universes that all originate from the breathing and pores of the sleeping Maha Vishnu as seen in painting below.

Deep within each Brahmanda, also known as a celestial egg ("Bhu-gola") as seen in painting below, there is an inner smaller secondary universe.

The sizes of both the outer Brahmandas and there inner secondary universe vary in size based on how many heads the Brahma in each universe has.

Our universe inside our Brahmanda is considered small because Brahma has only 4 heads.

In other universes within other Brahmandas, their Brahma may have hundreds of heads, even thousands or even a million, yes, it is almost inconceivable to understand.

Our small universe deep inside our surrounding Brahmanda, is described as being 500,000,000 yojana (4 billion miles) in diameter.

And is often called "Bhu-gola" because it is also a round spherical universe inside the greater spherical Brahmanda.

"Bhu-gola" simply means almost spherical or globe. So there are three earth (Bhu-gola)  descriptions

1 - The greater earth (Brahmanda) (Bhu-gola)

2 - The inner earth inside our Brahmanda is called "Bhu-gola" universe with its 14 Planetary Systems also called "Bhu-Mandala" 

3 - And "Bhu-gola" also refers to our small earth global sphere we live on within our middle planetary system called Bhuloka as well.

"Bhu-gola" describes the Earth globe as a round spherical planet, which is just a spec in one of the 14 planetary systems within our small universe also often called the Bhu-Mandala universe situated deep within the surrounding Brahmanda outer shell.

"Bhu-Mandala" is described in the 5th Canto of Srimad Bhagavatam as our inner material universe 4 billion miles in diameter inside our Brahmanda.

In this way, our small "Bhu-Mandala" universe with its 14 planetary systems, that is also described as "Bhu-gola", is surrounded by the greater "Bhu-gola" (Brahmanda) universe that encases our 4 billion mile diameter Bhu-mandala or Bhu-gola universe.

Therefore we can see that "Bhu-gola" can mean - 

1 - Our "Brahmanda universe" 

2 - The "inner secondary material universe inside the Brahmanda", 

3 - Our "Earth planet" within one of the 14 planetary systems that all exist within the inner secondary universe.

All the above are spherical or global in shape.

As explained, the size of our inner material universe deep inside our surrounding Brahmanda universe, is 500,000,000 yojana in diameter (4 billion miles).

I yojana = 8 miles

500,000,000 yojanas = 4 billion miles

So our Earth global sphere (7,917.5 miles in diameter) we humans live on and is NOT 4 billions miles in diameter as some foolishly claim.  

Therefore our Earth planet CANNOT be Bhu-mandala according to the figures in the 5th Canto of Srimad Bhagavatam! 

There it says Bhu-Mandala is 4 billions miles in diameter (500,000,000 yojanas) and is far too large of a description to be our small Earth Planet we live on.**