Gandvik (northern sámi: Juvravuonna, kvääni: Juuriperä) is a city in Nesseby.
In Norse mythology, Gandvík is a dangerous sea, known as the "Bay of Serpents" because of its tortuous shape.
The 12th-13th century Dane Saxo Grammaticus stated that Gandvik was an old name for the Baltic Sea (a name misspelt Grandvik in some translations).
However, there are two opposite theories about where Gandvik was situated, based on the 1323 Treaty of Nöteborg: in the Arctic Ocean or the Gulf of Bothnia.
However, Hversu Noregr byggðist, dating from the former part of the 13th century, is by most opinions referring to the White Sea when it uses the term Gandvik.