One world is composed of one Mount Meru, one sun, one moon, four great continents and the various seas and oceans that surround them. One-thousand such worlds form a small thousand-world system. One thousand small thousand-world systems form a medium thousand-world system. One thousand medium thousand-world systems form a great thousand-world system. This set of worlds is usually referred as THREE-THOUSAND GREAT-THOUSAND-WORLD SYSTEMS. The four great continents are ruled by four direction kings who live halfway up Mount Meru (Mani Kabum, 2007).
According to Buddhist cosmology, Jambudvipa is the southern continent (which is the world we are staying now) of the four continents that surround Mount Meru (Mani Kabum, 2007).