thumb|Orientation of different continents in [[Columbia (supercontinent)|Columbia]]
Nena, an acronym for Northern Europe–North America, was the Early Proterozoic amalgamation of Baltica and Laurentia into a single "cratonic landmass", a name first proposed in 1990. Since then several similar Proterozoic supercontinents have been proposed, including Nuna and Arctica, that include other Archaean cratons, such as Siberia and East Antarctica.
In the original concept Nena formed in the Penokean, Makkovikan, Ketilidian, and Svecofennian orogenies. This concept would eventually be developed to the modern day conceptualization of the Nena supercontinent which includes additions of the Angara, Antarctica, and Siberia landmasses.
Throughout the amalgamation of the microcontinents which would form proto-Nena, several significant geologic processes occurred including orogenesis and continental magmatic accretion. The by-products of these processes can be found numerous regions such as southwest Ontario, northwest British Isles, and Greenland.