The continent where 75N and 30E can be found is Europe. It is marked by the 75th parallel north, a circle of latitude that is 75 degrees north of the Equator. This circle of latitude crosses Asia, Europe, Atlantic Ocean, North America and the Arctic Ocean. The Atlantic Ocean has a coordinates of 75N and 0E while the Barents Sea has coordinates of 75N and 18.27E which makes it the closest area where 75N and 30E can be found.
The Barents Sea is a marginal sea of the Arctic Ocean and is located between Norwegian and Russian territorial waters. It has a surface area of approximately 1,400,000 square kilometers and an average depth of 750 ft.