File:Early Eocene Arctic basin.PNG

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Source: Brinkhuis, H.; Schouten, S.; Collinson, M.E.; Sluijs, A.; Sinninghe Damsté, J.S.; Dickens, G.R.; Huber, M.; Cronin, T.M.; Onodera, J.; Takahashi, K.; et al. (2006). "Episodic fresh surface waters in the Eocene Arctic Ocean". Nature 441: 7093. doi:10.1038/nature04692. PMID 16752440. 

Rationale: Used to illustrate the palæogeography of the region, an essential point which is difficult to illustrate verbally.