these are Flinders Island in the Furneaux Group of Bass Strait, King Island in the west of Bass Strait, Cape Barren Island south of Flinders Island, Bruny Island separated from Tasmania by the D'Entrecasteaux Channel, Macquarie Island 1,500 km from Tasmania, and Maria Island off the east coast. Tasmania features a number of separated and continuous mountain ranges. The majority of the state is defined by a significant dolerite exposure, though the western half of the state is older and more rugged, featuring buttongrass plains, temperate rainforests, and quartzite ranges, notably Federation Peak and Frenchmans Cap. The presence of these mountain ranges is a primary factor in the rain shadow effect, where the western half receives the majority of rainfall, which also influences the types of vegetation that can grow. The Central Highlands feature a large plateau which forms a number of ranges and escarpments on its north side, tapering off along the south, and radiating into the highest mountain ranges in the west. At the north-west of this, another plateau radiates into a system of hills where takayna / Tarkine is located. The Interim Biogeographic Regionalisation for Australia (IBRA) divides Tasmania into 9 bioregions: Ben Lomond, Furneaux, King, Central Highlands, Northern Midlands, Northern Slopes, Southern Ranges, South East, and West. Environment Tasmania's environment consistes of many different biomes or communities across its different regions. It is the most forested state in Australia, and preserves the country's largest areas of temperate rainforest. A distinctive type of moorland found across the west, and particularly south-west of Tasmania, are buttongrass plains, which are speculated to have been expanded by Tasmanian Aboriginal burning practices. Tasmania also features a diverse alpine garden environment, such as cushion plant. Highland areas receive consistent snowfall above ~1,000 metres every year, and due to cold air from Antarctica, this level often reaches 800 m, and more occasionally 600 or 400 metres. Every five or so years, snow can form at sea level. This environment gives rise to the cypress forests of the Central Plateau and mountainous highlands. In particular, the Walls of Jerusalem with large areas of rare pencil pine, and its closest relative King Billy pine. On the West Coast Range and partially on Mount Field, Australia's only winter-deciduous plant, deciduous beech is found, which forms a carpet or krummholz, or very rarely a 4-metre tree. Tasmania features a high concentration of waterfalls. These can be found