Amazon biome Amazonas, Brazil contains campinarana, dense rainforest and contact between campinarana and rainforest. The vegetation formations include terra firme forests and igapós. Submontane forests climb the first steps of the Guiana Plateau to about , followed by montane forests. Lichens and bromeliads are found up to . There is also alpine tundra in the tabular plateaus. The Amazon basin contains several large areas of moist forest, collectively called the Amazon rainforest. These are the Caquetá, Japurá-Solimões-Negro, Juruá-Purus, Madeira-Tapajós, Napo, Purus-Madeira, Solimões-Japurá, Southwest Amazon, Tapajós-Xingu, Tocantins-Pindara, Uatuma-Trombetas, Ucayali and Xingu-Tocantins-Araguaia moist forests. Each has distinctive vegetation. In the broad definition favored by
Amazon biome form barriers to the geodispersal of plants, animals and even insects. Thus the white-fronted capuchin ("Cebus albifrons") and hairy saki ("Pithecia hirsuta") are found west of the Tapajós, while the white-nosed saki ("Chiropotes albinasus") is only found east of the river. The World Wildlife Fund divides the biome into ecoregions, often defined as the regions lying between major tributaries of the Amazon. Most of the interior of the Amazon basin is covered by rainforest. The dense tropical Amazon rainforest is the largest tropical rainforest in the world. It covers between of the Amazon biome. The somewhat vague numbers are because