Which geographic feature was central to a marketing campaign that increased tourism by over 300% in five years and created a global product phenomenon?

Geographic locations often create powerful brand identities that drive tourism and product sales. From Paris's romantic allure to Iceland's otherworldly landscapes, places have become marketing powerhouses. This trivia question explores how geographic features have been leveraged in one of the most successful product marketing campaigns that completely transformed a destination's global recognition and visitor numbers.

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Iceland's Blue Lagoon geothermal spa (promoting skincare products)
New Zealand's landscapes (through Lord of the Rings film promotion)
Norway's fjords (via cruise line advertising)
Croatia's coastline (through Game of Thrones filming locations)