2018年07月19日

'Lake Mashu', in the mountainous area of the eastern part of Hokkaido, is known as the world's second highest transparent lake after 'Lake Baikal' in Russia.

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Lake Mashu, which was formed by volcanic eruption, is a caldera lake. As being located remotely and secludedly, with no rivers flowing in and out, it features very transparent water. A small island called 'Kamuishu' in the middle of the lake and 'Mashu-dake' active volcano on the right-hand of the photo are seen. The transparency of this lake actually was a little better than Lake Baikal from 1930 to 1946, that is, Lake Mashu used to be world's No.1. However its transparency has gradually deteriorated since 1952.
The effective countermeasures are hard to find, because the cause of the water contamination is still unknown in spite of the study.
Even so, the water of the lake shows beautiful blue so-called 'Mashu Blue' on glorious days.

Licensed tour guide/travel consultant,
Masahisa Takaki.

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posted by masahisa at 13:12 | Hokkaido | このブログの読者になる | 更新情報をチェックする