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
4%
4%
12%
79%
24
flagAustria
6%
3%
15%
75%
33
flagItaly
26%
4%
4%
66%
50
flagSwitzerland
15%
3%
15%
65%
26
flagRepublic of Ireland
33%
0%
3%
63%
33
flagAustralia
28%
2%
10%
59%
89
flagUkraine
18%
13%
9%
59%
22
flagGermany
21%
1%
20%
55%
300
flagPoland
23%
7%
14%
52%
20303
flagthe Netherlands
30%
12%
6%
51%
33
flagGreece
39%
2%
12%
46%
41
flagthe United States
27%
9%
16%
45%
862
flagthe Philippines
28%
11%
11%
45%
35
flagFrance
25%
5%
25%
45%
20
flagthe United Kingdom
25%
8%
19%
44%
279
flagCanada
28%
14%
14%
43%
64
flagIndonesia
33%
6%
20%
40%
15
flagIndia
30%
16%
15%
36%
263
flagUnknown
44%
8%
20%
28%
25
flagPakistan
44%
7%
22%
25%
27