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A sea floor and land relief map based on a tectonic ‘plate’ was recently published by the Canadian Department of Energy, Mines and Resources. Geoscientists working in the Pacific Northwest and British Columbia and in the adjacent sea areas of the northeast Pacific Ocean are increasingly focusing attention on the Juan de Fuca Plate and its zone of interaction with North America. In practical terms, realization of the tectonic unity and similarity of much of the region has been hampered by the fact that published Canadian and U.S. topographic maps stopped at the border and were of different scales, projections, and styles. Offshore bathymetric maps by National Ocean Survey and other U.S. and Canadian agencies differed again and seldom included land information.