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

Answers by country

Black Sea
Red Sea
Yellow Sea
Sargasso Sea
answers
flagItaly
2%
2%
2%
90%
76
flagThailand
4%
4%
0%
87%
24
flagRepublic of Ireland
1%
15%
5%
76%
51
flagRussia
7%
9%
7%
75%
145
flagAustralia
16%
8%
5%
70%
60
flagGreece
11%
1%
15%
70%
51
flagthe Netherlands
10%
13%
6%
67%
46
flagSwitzerland
3%
25%
3%
66%
56
flagUkraine
5%
15%
13%
64%
353
flagKazakhstan
12%
18%
6%
62%
32
flagthe United States
17%
10%
9%
61%
674
flagthe United Kingdom
17%
11%
9%
60%
315
flagAustria
2%
22%
14%
59%
87
flagPoland
15%
14%
9%
58%
15684
flagGermany
11%
15%
13%
58%
601
flagBelarus
9%
21%
12%
56%
32
flagCanada
20%
13%
8%
55%
59
flagUnknown
20%
16%
8%
54%
24
flagSpain
18%
13%
13%
54%
22
flagIndia
30%
16%
22%
29%
118