Continent Continent A continent is one of several very large landmasses of the world. Generally identified by convention rather than any strict criteria, up to seven regions are commonly regarded as continents. Ordered from largest in area to smallest, they are: Asia, Africa, North America, South America, Antarctica, Europe, and Australia. Geologically, the continents largely correspond to areas of continental crust that are found on the continental plates. However, some areas of continental crust are regions covered with water not usually included in the list of continents. Zealandia is one such area (see submerged continents below). Islands are frequently grouped with
Smallest organisms that lives between sand grains on the coast of India. Its maximum length is only 4 mm. The smallest sea urchin, "Echinocyamus scaber", has a test only 6 mm across. "Patiriella parvivipara" is the smallest starfish, at only 5 mm across. The smallest vertebrates (and smallest amphibians) known are "Paedophryne amauensis" frogs from Papua New Guinea, which range in length from , and average . Previously, the title of smallest vertebrate was held by members of the fish genus "Paedocypris" of Indonesia. The one of world's smallest fish based on the minimum size at maturity is "Paedocypris progenetica" from Indonesia,