A forest, also referred to as a wood or the woods, is an area with a high density of trees. As with cities, depending on various cultural definitions, what is considered a forest may vary significantly in size and have different classifications according to how and of what the forest is composed. A forest is usually an area filled with trees but any tall densely packed area of vegetation may be considered a forest, even underwater vegetation such as kelp forests, or non-vegetation such as fungi, and bacteria. Tree forests cover approximately 9.4 percent of the Earth's surface (or 30 percent of total land area), though they once covered much more (about 50 percent of total land area). They function as habitats for organisms, hydrologic flowmodulators, and soil conservers, constituting one of the most important aspects of the biosphere.
A typical tree forest is composed of the overstory (canopy or upper tree layer) and the understory. The understory is further subdivided into the shrub layer, herb layer, and also the moss layer and soil microbes. In some complex forests, there is also a well-defined lower tree layer. Forests are central to all human life because they provide a diverse range of resources: they store carbon, aid in regulating the planetary climate, purify water and mitigate natural hazards such as floods. Forests also contain roughly 90 percent of the world's terrestrial biodiversity.
Réunion (French: La Réunion, IPA: [la ʁeynjɔ̃] ( listen); previously Île Bourbon) is a French island with a population of about 800,000 located in the Indian Ocean, east of Madagascar, about 200 kilometres (120 mi) southwest of Mauritius, the nearest island.
Administratively, Réunion is one of the overseas departments of France. Like the other overseas departments, Réunion is also one of the 27 regions of France (being an overseas region) and an integral part of the Republic with the same status as those situated on the European mainland.
Réunion is an outermost region of the European Union and, as an overseas department of France, is part of the Eurozone.