Sea of Japan.
There is no river at 30 degrees north and 40 degrees east.
Antarctica is located 0 degrees north and 40 degrees east.
The coordinates 40 degrees north and 100 degrees east correspond to Asia.
Northeastern Turkey.
The North Atlantic
40 degrees north latitude and 105 degrees east longitude intersect in Asia.
Turkey
The nearest town to 40 North, 30 East is Bozuyuk in Turkey.
That point is in Turkey.
A location at 40 degrees north and 90 degrees east falls in Central Asia, specifically in Kazakhstan, near the border with Uzbekistan. It is a remote area characterized by vast steppes and desert landscapes.
The nearest town to 40 North, 30 East is Bozuyuk in Turkey.
It's in eastern Anatolia, in eastern Turkey.