Last summer I was in Siberia, near Lake Baikal. It was very warm there. Lake Baikal is the 'Great Blue Eye of Siberia'. It is very deep and old. It is over 25 million years old! The water is fresh. It is clean and clear, too!

The text describes Lake Baikal in Siberia.

Lake Baikal is located in Siberia and is described as being very warm.

It is famously known as the 'Great Blue Eye of Siberia'.

The lake is characterized as being very deep and ancient, with an age exceeding 25 million years.

The water of Lake Baikal is noted for its freshness, cleanliness, and clarity.