Why is the San Francisco Bay water murky?

The brown in the Bay Waters is largely a plume of sediment, the raw material necessary to rebuild wetlands and maintain their health. That sediment, though, is mixed up with pollutants — toxic mercury from old mines, Lester McKee, a scientist with the San Francisco Estuary Institute tells News Group.



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The Weddell Sea has been claimed by scientists to have the clearest waters of any ocean in the world. Described by a historian as “the most wretched and dismal region on earth”, due to the flash freezes that caught Shackleton's ship, its clarity is only belied by the sheer depth of the ocean below.

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The Tenderloin District is the most dangerous neighborhood in San Francisco. Located in Downtown San Francisco, the area has a population of 39,000 and an extremely high violent crime rate, which is over 270% higher than the national average. The Tenderloin has more violent crimes, such as robberies and assaults.

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“The Caribbean sea is so clear and blue because it has little presence of plankton – or other substances – and it's relatively shallow so most of the light is reflected. As a result, we see beautiful clear blue water. Water gets its color from the interaction of sunlight with water and the substances in the water.”

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Grand Anse Beach, Grenada One of the big attractions here is some of the clearest water in the Caribbean, the pristine sea floor sloping away gently at first and dropping off into navy blue depths. But even 90 feet from the shore, the visibility is exceptional and the sea teeming with life.

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Blue Lake, New Zealand Blue Lake has underwater visibility up to 70 to 80 meters or 230 to 260 feet down, which is insane! Apart from being the world's clearest lake, it's also the clearest body of natural freshwater. The water in Blue Lake is comparable to distilled water based on laboratory measurements.

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Swimming is not recommended here due to strong currents and cold water. If you do want to go for a dip, Ocean Beach is often considered San Francisco's most popular, with people flocking to it for swimming, surfing, kayaking, and surf fishing.

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