The Pacific Ocean.
The country located at 140°E longitude and 30°S latitude is New Zealand.
Since you did not specify the direction of longitude, the country located at 20 degrees south latitude and 140 degrees east longitude is Australia, while the country located at 20 degrees south latitude and 140 degrees west longitude is France. The location is French Polynesia, which is a French territory.
Japan
The Arctic Ocean
your mom, iowa
Latitude 40 North and longitude 140 East intersect in Japan. More specifically, this point is located near the coast of the main island of Honshu.
You would be stranded indeed, at sea, about 183 miles north of the Indonesian city of Jayapura on the north coast of the island of New Guinea. And by the way, the "140 degrees east" coordinate is your "longitude".
There is no country at the coordinates 80 degrees south latitude and 140 degrees west longitude. It is a point on the continent of Antarctica.
The sea located at 73 degrees north latitude and 140 degrees west longitude is the Chukchi Sea, which lies between Alaska and Russia in the Arctic Ocean.
In the middle of the Pacific
Asia
Miyado, Tsukubamirai, Ibaraki Prefecture 300-2426, Japan.