North America, just a little bit of Greenland, Europe, and Asia
At approximately 87 degrees west longitude, the countries in Central America include parts of Belize and Guatemala. This longitude passes through the eastern regions of Guatemala and the northern part of Belize. Additionally, it may also touch the eastern edge of Honduras, depending on the specific latitude.
The 60 degrees W line of longitude touches South America and Antarctica. In South America, it runs through countries like Brazil and Argentina. In Antarctica, it passes through the eastern part of the continent. North America does not intersect this line of longitude.
The Pacific Ocean doesn't touch three continents: Africa, Antarctica, and Europe.
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There are a lot of countries that do not touch any ocean. I'm guessing Mongolia, a few countries in Africa such as Chad and Sudan, Austria and Slovakia (in Europe).
Switzerland is a country in the continent of Europe. It is landlocked and all countries that surround it are also in Europe, so it does not touch any other continent.
The Atlantic and Arctic oceans touch Europe.
Europe, Asia and North America are the only three continents that go that far north. One fact is that Europe, Asia and North America are also the three continents that touch the Arctic Circle.
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-- Greenland -- Canada -- Venezuela -- Guyana -- Brazil -- Bolivia -- Paraguay -- Argentina -- Uruguay -- (Antarctica -- a continent without countries)
The states that touch the 155th meridian of west longitude are California, Nevada, Idaho, and Montana.