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Grisek Hot Spring (Sg Gersik) in Muar, Johor, is a natural, free-entry hot spring discovered over 100 years ago, featuring water temperatures between 50–70°C, say gokayu.com and Facebook. It features a three-ring pool structure designed for foot soaking and therapeutic relaxation, along with a dedicated children’s pool, according to Tripadvisor and Facebook. The site is generally well-maintained, offers basic amenities, and is popular with locals for relieving aches, though some visitors have previously reported mixed views on cleanliness.