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The universe is divided into three realms: the lower realm (Adholōka), the middle realm (Madhyalōka), and the upper realm (Urdhvalōka). The central point of these realms is Mount Meru. Mount Meru is located in the middle realm (Madhyalōka). Its base is one thousand yojanas wide and its height is sixty-six thousand yojanas above the ground. Its length and width extend ten thousand yojanas in all four directions on the flat surface of the earth.
The lower realm (Adholōka) begins nine hundred yojanas below the base of Mount Meru and extends eighteen hundred yojanas upwards. This means that the middle realm (Madhyalōka) is eighteen hundred yojanas in height, nine hundred yojanas below and nine hundred yojanas above the base of Mount Meru. The area above the middle realm (Madhyalōka) is called the upper realm (Urdhvalōka).
The height of the lower realm (Adholōka) and the upper realm (Urdhvalōka) is greater than their width, while the middle realm (Madhyalōka) is wider and longer than its height. The middle realm (Madhyalōka) is only eighteen hundred yojanas high, but its length and width are one rāju.
The length and width of the lower realm (Adholōka) and the upper realm (Urdhvalōka) are not uniform. The length and width of the lower realm (Adholōka) is slightly less than seven rājus in the seventh hell, while the first hell is one rāju long and wide, which is equal to the length and width of the middle realm (Madhyalōka). The length and width of the upper realm (Urdhvalōka) is five rājus in the fifth heaven, and then decreases by one rāju for each subsequent heaven, until the topmost part of the realm is one rāju long and wide. This means that the final part of the upper realm (Urdhvalōka) is as long and wide as the middle realm (Madhyalōka). The shape of the universe is depicted in the attached diagram.