||This article may contain original research. (February 2011)|
Jambudvīpa (Devanagari: जम्बुद्वीप) is the dvipa ("island" or "continent") of the terrestrial world, as envisioned in the cosmologies of Hinduism, Buddhism, and Jainism, which is the realm where ordinary human beings live. Although the description given below does not go with the Jainism description of Jambudvipa and its surroundings, the word Jambudvipa holds a very important place in Jain Cosmology, and has a different architecture.
The word Jambudvipa literally refers to "the land of Jambu trees" where Jambu is the name of the species (also called Jambul or Indian Blackberry) and dvipa means "island" or "continent".
Puranic description as per Hindu cosmology 
According to Puranic cosmography, the entire Cosmos is divided into seven concentric island continents (sapta-dvipa vasumati) separated by the seven encircling oceans, each double the size of the preceding one (going out from within). The seven continents of the Puranas are stated as Jambudvipa, Plaksadvipa, Salmalidvipa, Kushadvipa, Krounchadvipa, Shakdvipa, and Pushkaradvipa. Seven intermediate oceans consist of salt-water, sugarcane juice, wine, ghee, curd, milk and water respectively.
Continent Jambudvipa (Indian Blackberry Island), also known as Sudarshanadvipa, forms the innermost concentric island in the above scheme. Its name is said to derive from a Jambu tree (another name for the Indian Blackberry). The fruits of the Jambu tree are said, in the Viṣṇupurāṇa (ch.2) to be as large as elephants and when they become rotten and fall upon the crest of the mountains, a river of juice is formed from their expressed juice. The river so formed is called Jambunadi (Jambu river) and flows through Jambudvipa, whose inhabitants drink its waters. Insular continent Jambudvipa is said to comprise nine varshas (zones) and eight significant parvatas (mountains).
Markandeya Purana portrays Jambudvipa as being depressed on its south and north and elevated and broad in the middle. The elevated region forms the varsha named Ila-vrta or Meruvarsha. At the center of Ila-vrta lies the golden Mount Meru, the king of mountains. On the summit of Mount Meru, is the vast city of Lord Brahma, known as Brahmapuri. Surrounding Brahmapuri are 8 cities - the one of Lord Indra and of seven other Devatas.
Markandeya Purana and Brahmanda Purana divide Jambudvipa into four vast regions shaped like four petals of a lotus with Mount Meru being located at the center like a pericarp. The city of Brahmapuri is said to be enclosed by a river, known as Akash Ganga. Akash Ganga is said to issue forth from the foot of Lord Vishnu and after washing the lunar region falls "through the skies" and after encircling the Brahmapuri "splits up into four mighty streams", which are said to flow in four opposite directions from the landscape of Mount Meru and irrigate the vast lands of Jambudvipa.
The common names of the dvīpas, having their varṣas (9 for Jambu-dvīpa, 7 for the other dvīpas) with a mountain and a river in each varṣa, is given in several Purāṇas . There is a distinct set of names provides, however, in other Purāṇas . The most detailed geography is that described in the Vāyu Purāṇa .
In Buddhism 
The Buddhist cosmology divides the bhūmaṇḍala (circle of the earth) into three separate levels: Kāmadhātu (Desire realm), Rūpadhātu (Form realm), and Ārūpyadhātu (Formless realm). In the Kāmadhātu is located Mount Sumeru which is said to be surrounded by four island-continents. "The southernmost island is called Jambudvīpa". The other three continents of Buddhist accounts around Sumeru are not accessible to humans from Jambudvīpa. Jambudvīpa is shaped like a triangle with a blunted point facing south. In its center is a gigantic Jambu tree from which the continent takes its name, meaning "Jambu Island".
Jambudvīpa is the region where the humans live and is the only place where a being may become enlightened by being born as a human being. It is in Jambudvīpa that one may receive the gift of Dharma and come to understand the Four Noble Truths, the Noble Eightfold Path and ultimately realize the liberation from the cycle of life and death. Another reference is from the Buddhist text Mahavamsa, where the emperor Ashoka's son Mahinda introduces himself to the Sri Lankan king Devanampiyatissa as from Jambudvipa, referring to what is now the Indian mainland.
In Jainism 
According to Jain cosmology, Jambūdvīpa is at the centre of Madhyaloka, or the middle part of the universe, where the humans reside. Jambūdvīpaprajñapti or the treatise on the island of Roseapple tree contains a description of Jambūdvīpa and life biographies of Ṛṣabha and King Bharata. Trilokasāra (Essence of the three worlds), Trilokaprajñapti (Treatise on the three worlds), Trilokadipikā (Illumination of the three worlds) and Kṣetrasamāsa (Summary of Jain geography) are the other texts that provide the details of Jambūdvīpa and Jain cosmology. Madhyaloka consists of many continent-islands surrounded by oceans, first eight whose names are :-
Continent/ Island Ocean Jambūdvīpa Lavanoda (Salt - ocean) Ghatki Khand Kaloda (Black sea) Puskarvardvīpa Puskaroda (Lotus Ocean) Varunvardvīpa Varunoda (Varun Ocean) Kshirvardvīpa Kshiroda (Ocean of milk) Ghrutvardvīpa Ghrutoda (Ghee ocean) Ikshuvardvīpa Iksuvaroda (Ocean of Sugarcane Juice) Nandishwardvīpa Nandishwaroda
Mount Meru is at the centre of the world surrounded by Jambūdvīpa, in form of a circle forming a diameter of 100,000 yojanas.
Jambūdvīpa continent has 6 mountains, dividing the continent into 9 zones (Ksetra). The names of these zones are:
- Bharat Kshetra
- Mahavideha Kshetra
- Airavat Kshetra
- Hairanyvat Kshetra
- Haimavat Kshetra
See also 
- The Jambudvipa of Buddhist texts (metta.lk)