The state's most important rivers are the Missouri, rising in southwest Montana and flowing north and then east across the state, and the Yellowstone, which crosses southeastern Montana to join the Missouri in North Dakota near the Montana border.
Distribution in South Africa. Hoverflies can be found all over the country between the sea-shores and the mountains. In total, there are at least 180 species recorded from South Africa. The number of species declines from the northeast to the southwest. However, some species have only or predominately been found in the Western Cape.
True possums are found in New Guinea, Australia (including Tasmania), Sulawesi (Indonesia) and a few other small islands in the Pacific region. Although not native to New Zealand, the brush-tailed possum was introduced into that country over a century ago and has subsequently become a pest.