Which sea was considered to be non-navigable?

Black Sea
Red Sea
Yellow Sea
Sargasso Sea
The Atlantic Ocean's Sargasso Sea was named after the Sargassum seaweed, which floats en masse on the surface there. Although it was formerly thought to cover the entirety of the Sargasso Sea, making navigation impossible, it has since been found to occur only in drifts. The historic incidents of sailing ships being trapped there are now considered due to the often calm winds of the horse latitudes.
Lynn Desmond
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Very interesting!
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Answers by country

Black Sea
Red Sea
Yellow Sea
Sargasso Sea
answers
flagFrance
8%
0%
0%
91%
12
flagItaly
3%
1%
3%
90%
60
flagRepublic of Ireland
2%
15%
5%
76%
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flagGreece
9%
2%
12%
75%
41
flagLithuania
0%
25%
0%
75%
12
flagRussia
9%
11%
5%
73%
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flagBulgaria
11%
5%
5%
70%
17
flagAustralia
18%
9%
5%
66%
53
flagSwitzerland
0%
30%
4%
65%
23
flagAustria
3%
18%
15%
63%
33
flagUkraine
4%
18%
14%
62%
201
flagthe United Kingdom
16%
11%
9%
61%
231
flagGermany
13%
12%
11%
61%
225
flagthe United States
19%
10%
10%
58%
509
flagthe Netherlands
13%
16%
8%
58%
36
flagPoland
16%
15%
10%
57%
13861
flagUnknown
20%
16%
8%
54%
24
flagCanada
20%
13%
11%
52%
44
flagSpain
23%
23%
15%
38%
13
flagIndia
27%
13%
21%
36%
74