Nena is a proposed supercontinent, an ancient precursor to Pangea. It would have formed about 1,900 million years ago, and was an amalgamation of Baltica and Laurentia into a single landmass.
Nena is an acronym for Northern Europe–North America. It is currently in competition with some other theoretical early Proterozoic supercontinents: other proposed configurations of various tectonic plates include Nuna, Arctica, and Columbia.