河水和海水颜色（河流的颜色是红色的）

The river shown in the photographs below is Caño Cristales, an amazingly colorful river inColombia.The river takes on many different colors, including yellow, green, blue, black, but especially red, caused by the weeds at the bottom of the river (Macarenia clavigera).

The river is commonly called “The River of Five Colors”, “The Liquid Rainbow” “The River That Ran Away to Paradise”, and “The Most Beautiful River in the World” due to its striking colors.

在哥伦比亚，有世界上著名的“彩虹河”。每年根据四季变化，在不同时期内，会变换好几种颜色（河里有不同颜色的藻类植物：红色的，黄色的，绿色的等)，如果在干湿季节，水位上升到一定程度的时候，许多品种的藻类和青苔会同时出现，显示出令人眼花缭乱的颜色；斑点，蓝，绿，黑，红等色调混合一起。因此，人们把它称为“彩虹河”或者“五色河”。人人都说它是大自然赐给人类的“生物遗产”，公认它为世界上最美的河。

This is what Caño Cristales looks like with its beautiful red color. Looks like something straight out of The Bible.

五彩斑斓

Interestingly, for most of the year the river is actually indistinguishable from any other river.

It’s normally just a bed of rocks covered in dull green mosses in the cool, clear current.

水面上那层厚厚的苔藓

However, for a short period of time every year, the river comes to life in a vibrant explosion of colors.

其实一年中，变色持续时间很短，大部分时候它看起来很普通

During the short span between the wet and dry seasons, when the water level is just right, a unique species of plant that lines the river floor called Macarenia clavigera turns a brilliant red. It is offset by splotches of yellow and green sand, blue water, and a thousand shades in between.

“彩虹河”是自然保护区，在2009年才重新对外开放

The site of the river was effectively closed to tourists for several years because of guerrilla activity in the region along with concerns about the impact of unregulated tourist traffic.

It was reopened to visitors in 2009, and today there are several Colombian tourist agencies that will take visitors of a guided tour of the area.

This is what the red weed known as Macarenia clavigera looks like.

红色时期的彩虹河

Wikipedia

This is what I imagine a river downstream from a Skittles factory looks like. Taste the rainbow!

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