The world's tallest artificial structure is the 829.8-meter-tall (2,722 ft) Burj Khalifa<span> in Dubai. The building gained the official title of "Tallest Building in the World" and the tallest self-supported structure at its opening on January 9, 2010.</span>
Rivers, fertile soil, temperate climate
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<em>A cliff is a steep and often sheer rock face. If you stand on the edge of a cliff and peer over, you'll be able to see the waves crashing on the rocks below.</em>
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