Hot index is not rating, it reflects the extent of how tourists know it. Hot index is nothing to do with whether the attraction is good or not, an attraction that everyone knows may not be good, one that nobody knows may not be bad.
1: Almost no one knows
2: Rare people know
3: Some people know
4: Most people know
5: Everyone knows
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Hippos Yawn is located in the eastern suburb of Hyden, a small town in the southwestern part of Western Australia, only about a kilometer drive from the famous (Wave Rock) of wavy rock.
Hippos Yawn is a boulder named for its resemblance to the head of a hammering hippo, which allows visitors to climb through the beak of the hippo, leaving interesting images.