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%
2%
12%
72%
105
flagRepublic of Ireland
26%
4%
4%
66%
50
flagItaly
28%
3%
4%
63%
66
flagSwitzerland
16%
1%
20%
60%
53
flagUkraine
18%
13%
9%
59%
22
flagGermany
19%
3%
16%
58%
732
flagAustralia
29%
3%
10%
57%
99
flagPoland
23%
7%
14%
53%
21966
flagGreece
36%
2%
10%
51%
47
flagthe Netherlands
31%
8%
8%
51%
45
flagCanada
26%
13%
12%
47%
72
flagFrance
23%
4%
23%
47%
21
flagthe United States
27%
9%
15%
46%
1003
flagthe Philippines
26%
11%
14%
45%
42
flagthe United Kingdom
26%
9%
18%
43%
339
flagPakistan
37%
5%
17%
40%
35
flagIndia
32%
15%
16%
35%
296
flagUnknown
44%
8%
20%
28%
25
flagNigeria
25%
10%
35%
20%
20