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!
reach: rather globalalgaeAtlantic Oceangeographic namesgeographyseas

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Black Sea
Red Sea
Yellow Sea
Sargasso Sea
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flagThailand
4%
4%
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23
flagItaly
2%
2%
2%
90%
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flagRepublic of Ireland
2%
16%
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flagRussia
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flagGreece
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72%
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flagAustralia
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flagthe Netherlands
10%
13%
6%
67%
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flagUkraine
5%
15%
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64%
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flagSwitzerland
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3%
64%
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flagKazakhstan
12%
18%
6%
62%
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flagBelarus
3%
23%
11%
61%
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flagthe United States
18%
10%
9%
60%
658
flagthe United Kingdom
17%
11%
9%
60%
313
flagAustria
2%
21%
15%
59%
82
flagPoland
15%
14%
9%
58%
15543
flagGermany
12%
15%
13%
57%
578
flagCanada
20%
13%
8%
55%
58
flagUnknown
20%
16%
8%
54%
24
flagSpain
19%
14%
14%
52%
21
flagIndia
30%
16%
21%
29%
114