Vedic scriptures speak of fourteen worlds. Seven of the worlds exist on three higher planes: Bhuloka, the first world or the earthly plane; Antarloka, the second world or the subtle, astral plane; and Brahmaloka, the third world or the causal plane of God. These three planes can also be viewed as dimensions.
Bhuloka is the dense outermost dimension of being and consciousness. It is the physical world perceived by the senses. Antarloka is the intermediate dimension, the sphere of gods and higher beings, that exists in between the earthly plane and God’s plane. It is a subtle, astral dimension of consciousness. Brahmaloka belongs to Lord Brahma, the Creator. It is both the highest and the innermost dimension. It is pure spirit. Brahmaloka is also known as Karanaloka, the causal plane or as Sivaloka, the plane of Lord Siva the Destroyer who, through destruction, causes a new cycle of creation. To reach this plane is to become entirely absorbed or dissolved in the Divine Spirit and to merge into or become One with the eternal God. To enter Brahmaloka is to end the cycle of birth and death.
Learn more about the Vedic Scriptures in On Hinduism by Irina Gajjar.