The "Gold Waterfall" (officially known as the Golden Waterfall or Huángjīn Pùbù) is a famous natural landmark located in the Ruifang District of New Taipei City, Taiwan, near the historic mountain village of Jiufen. The waterfall is renowned for its striking golden-bronze hue, which creates a high-fidelity contrast against the lush green hills. This unique coloration is not caused by actual gold, but by a natural geological phenomenon: the area is rich in heavy metal minerals like copper and iron sulfide (pyrite). As rainwater seeps through the old mining tunnels of the nearby Jinguashi gold and copper mines, it undergoes a chemical reaction that deposits iron and sulfur into the water, staining the rocks a brilliant golden-orange. While visually stunning, the water is highly acidic and toxic due to the high mineral content, so visitors are strictly advised to view it from the designated platforms rather than touching the water. The runoff eventually flows into the "Yin-Yang Sea," where the yellow mineral-rich water meets the blue ocean, creating a permanent bi-color swirl in the bay.