The strange lake contains millions of rainbow-colored stones

Lake McDonald is not only the largest, longest and deepest lake in Glacier National Park, Montana State, USA, but it is also bestowed by nature with colorful stones hidden in the clear water, creating so beautiful sparkling beauty.

Glacier National Park, located in the state of Montana, USA, bordering the Canadian border is the convergence of more than 700 lakes, of which only 131 lakes are named, 200 lakes are over 2 hectares in size, and more than a dozen lakes covering an area of ​​thousands of acres surrounded by mountains.

Colorful colored stones at Lake McDonald.(Photo: Internet).

Water in these lakes is very clear. Because of its low temperature background over the years, it prevents the development of plankton. Nothing is unusual when you can see the details of the bottom of the lake at a depth of more than 9m.

One of the outstanding features of some lakes is the presence of colorful stones and gravel both underwater and on the shores of the lake. These rocks range in color from dark red to dark brown, green to blue, yellow, purple, . Of which the most prominent is the McDonald Lake located in the west of the park.

Lake clear water due to no plankton.(Photo: Internet).

Lake McDonald is not only the largest lake with a surface area of ​​more than 2,000 hectares, it is also the longest lake (over 15km), as well as the deepest lake (141 meters) among the lakes of Glacier National Park.

The color of the stones is determined by the presence or absence of iron.

According to Vicky Spring and Tom Kirkendall's "Glacier-Waterton International Peace Park" book :

"The color of the rocks is determined by whether or not the iron is present. The bright red stones along the Grinnel Glacier trail are due to the deposition of minerals in shallow waters , where iron is contaminated. - oxidation due to rising tide, this color stone usually has old ripples or ancient mud crevices ".

The green rocks are formed in deeper waters than red rocks. Although these stones contain the same amount of iron, they are not exposed to oxygen and are therefore less oxidized.

Stones in shallow water are often dark red due to oxidation.(Photo: Internet).

Blue stones are seen much in Otokomi Lake , while dark stones are mostly on the shores of McDonald Lake and along the McDonald River branch. Around Lake Trout Lake is the gathering place of red and green iron rich in iron.

These stones are present throughout Glacier National Park and are created in different periods. When the glacier comes, break big rocks into small pieces and roll them away. Many small stones then settled in lakes, including small lakes along the mountains and filled the lake. The erosion of the water stream makes the stones, gravel become smooth, clean and smooth.