Autumn colours in Plitvice Lakes National Park, Croatia

Autumn colours in Plitvice Lakes National Park, Croatia

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Savage River in Denali National Park, Alaska, USA

Savage River in Denali National Park, Alaska, USA

Potaro River plunging over the edge, Kaieteur Falls, Guyana

Potaro River plunging over the edge, Kaieteur Falls, Guyana

Hagimit Falls in Samal Island, Philippines

Hagimit Falls in Samal Island, Philippines

by ouantk on Flickr.Huai Mae Khamin waterfall in Kanchanaburi Province, Thailand.

by ouantk on Flickr.Huai Mae Khamin waterfall in Kanchanaburi Province, Thailand.