in small creeks, alpine streams, rapid rivers, or off precipitous plunges. Some of the tallest waterfalls are found on mountain massifs, sometimes at a 200-metre cascade. The most famous and most visited waterfall in Tasmania is Russell Falls in Mount Field due to its proximity to Hobart and stepped falls at a total height of 58 metres. Tasmania also has a large number of beaches, the longest of which is Ocean Beach on the West Coast at about 40 kilometres. Wineglass Bay in Freycinet on the east coast is a well-known landmark of the state. The Tasmanian temperate rainforests cover a few different types. These are also considered distinct from the more common wet sclerophyll forests, though these eucalypt forests often form with rainforest understorey and ferns (such as tree-ferns) are usually never absent. Rainforest found in deep gullies are usually difficult to traverse due to dense understorey growth, such as from horizontal (Anodopetalum biglandulosum). Higher-elevation forests (~500 to 800 m) have smaller ground vegetation and are thus easier to walk in. The most common rainforests usually have a 50-metre canopy and are varied by environmental factors. Emergent growth usually comes from eucalyptus, which can tower another 50 metres higher (usually less), providing the most common choice of nesting for giant wedge-tailed eagles. The human environment ranges from urban or industrial development, to farming or grazing land. The most cultivated area is the Midlands, where it has suitable soil but is also the driest part of the state. Insularity Tasmania's insularity was possibly detected by Captain Abel Tasman when he charted Tasmania's coast in 1642. On 5 December, Tasman was following the east coast northward to see how far it went. When the land veered to the north-west at Eddystone Point, he tried to keep in with it but his ships were suddenly hit by the Roaring Forties howling through Bass Strait. Tasman was on a mission to find the Southern Continent, not more islands, so he abruptly turned away to the east and continued his continent-hunting. The next European to enter the strait was Captain James Cook on HMS Endeavour in April 1770. However, after sailing for two hours westward into the strait against the wind, he turned back east and noted in his journal that he was "doubtful whether they [i.e. Van Diemen's Land and New Holland] are one land or no". The strait was named after George