Colin Monteath/ Hedgehog House / Purakaunui Falls, Catlins, New Zealand
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Jeff Foott / Indian Rhubarb (Darmera peltata) growing on rock in river, Cascade Creek, Yosemite National Park, California
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Jeff Foott / Spring run-off, Cascade Creek, Yosemite National Park, California
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Guy Edwardes / View of hikers from behind the Pericnik Waterfall, Slovenia, October 2018.
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Staffan Widstrand / Wild Wonders of China / Tree frog (Amolops afghanus) female sitting on moss Tongbiguan Nature Reserve, Dehong prefecture, Yunnan province, China, May.
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Yva Momatiuk & John Eastcott / Tourist next to cascades, Dynjandi Waterfall, Westfjords, Iceland
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Greg Basco/ BIA / Nauyaca Waterfalls, Dominical, Costa Rica
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Tony Wu / Humpback whale (Megaptera novaeangliae) executing a dramatic tail slap, throwing up a cascade of water with its powerful fluke, Vava'u, Tonga, South Pacific
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Orsolya Haarberg / View of a rainbow in the spray of Bjornefossen Waterfall, Saltfjellet-Svartisen National Park, Norway, August 2015.
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Jeff Vanuga / Night stars over Yosemite Falls, Yosemite National Park, California, USA, May 2014.
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Juan Carlos Munoz / Water cascading down Toberia falls, Andoin, Sierra Entzia Natural Park, Alava, Basque Country, Spain, April.
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Bruno D'Amicis / Tisisat Falls / Blue Nile Falls along the Blue Nile, south of Bahir Dar, Lake Tana Biosphere Reserve, Ethiopia. December 2013.