Why is the phrase crystal-blue waters a clich?

The phrase "crystal-blue waters" is considered a cliché because it has been overused in travel writing and marketing to describe scenic beaches and pristine lakes, losing its originality and impact. This repetitive usage often evokes a generic image rather than capturing the unique beauty of a specific location. As a result, it can come across as unoriginal and less evocative, making it less effective in engaging readers. To create a more vivid image, it's often better to use more descriptive and specific language.