The 78th parallel north is a circle of latitude that is 78 degrees north of the Earth's equatorial plane, in the Arctic. It crosses the Atlantic Ocean, Europe, Asia, the Arctic Ocean and North America. It is the southernmost integral parallel north that does not pass through any continental mainland (being slightly to the north of Cape Chelyuskin). At this latitude the sun is visible for 24 hours, 0 minutes during the summer solstice and nautical twilight during the winter solstice.

Around the world

Starting at the Prime Meridian and heading eastwards, the parallel 78° north passes through: ! scope="col" width="125" | Coordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean ! scope="row" | 🇳🇴 ! scope="row" style="background:#b0e0e6;" | Storfjorden ! scope="row" | 🇳🇴 ! scope="row" style="background:#b0e0e6;" | Barents Sea ! scope="row" style="background:#b0e0e6;" | Kara Sea ! scope="row" | 🇷🇺 ! scope="row" style="background:#b0e0e6;" | Kara Sea ! scope="row" style="background:#b0e0e6;" | Laptev Sea ! scope="row" style="background:#b0e0e6;" | Arctic Ocean ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Wilkins Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Prince Gustav Adolf Sea ! scope="row" style="background:#b0e0e6;" | Maclean Strait ! scope="row" style="background:#b0e0e6;" | Danish Strait ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Hassel Sound ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Norwegian Bay ! scope="row" style="background:#b0e0e6;" | Baumann Fiord ! scope="row" | 🇨🇦 ! scope="row" style="background:#b0e0e6;" | Nares Strait ! scope="row" | 🇬🇱 ! scope="row" | 🇬🇱 ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean