Which lake is the oldest in the world?

Caspian Sea
Lake Superior
Lake Victoria
Lake Baikal
Lake Baikal is the deepest and the oldest lake, at least 25 million years old. It was formed as an ancient rift valley. Due its age, size and isolation, it hosts about 1000 endemic species of plants and animals (which can be found nowhere else in the world).
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Answers by country

Caspian Sea
Lake Superior
Lake Victoria
Lake Baikal
answers
flagRussia
10%
3%
10%
76%
30
flagAustria
12%
3%
13%
72%
100
flagItaly
28%
3%
4%
63%
66
flagRepublic of Ireland
27%
4%
4%
63%
47
flagSwitzerland
18%
2%
18%
62%
50
flagUkraine
18%
13%
9%
59%
22
flagGermany
20%
3%
17%
58%
707
flagAustralia
29%
3%
10%
57%
99
flagPoland
23%
7%
14%
53%
21862
flagthe Netherlands
29%
9%
9%
52%
44
flagGreece
36%
2%
10%
51%
47
flagCanada
25%
14%
12%
47%
71
flagFrance
23%
4%
23%
47%
21
flagthe United States
27%
9%
15%
46%
988
flagthe Philippines
26%
12%
12%
46%
41
flagthe United Kingdom
26%
9%
18%
43%
336
flagPakistan
37%
5%
17%
40%
35
flagIndia
31%
15%
16%
35%
294
flagUnknown
44%
8%
20%
28%
25
flagNigeria
25%
10%
35%
20%
20