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%
0%
0%
94%
34
flagRussia
15%
5%
5%
73%
19
flagGreece
15%
0%
10%
73%
19
flagthe Netherlands
13%
0%
13%
73%
15
flagSwitzerland
0%
18%
9%
72%
11
flagUkraine
5%
15%
9%
69%
72
flagthe United Kingdom
18%
8%
7%
63%
116
flagCanada
13%
13%
13%
55%
29
flagPoland
17%
16%
10%
54%
11371
flagthe United States
22%
10%
11%
54%
380
flagUnknown
20%
16%
8%
54%
24
flagGermany
19%
14%
11%
53%
62
flagAustralia
24%
16%
12%
48%
25
flagIndia
33%
10%
20%
33%
48