The geologists of the USGS Astrogeology Branch maintain the names of basins. The IAU does not formally identify basins, partly because there is no universally accepted way to distinguish small basins from large craters. Where a basin coincides with a named feature or surrounds a named mare, that name is adopted for the basin. Where it is not, the practice is to name the basin for two named craters near its periphery (the Keeler-Heaviside Basin, for example). On annotated images, basins with compound names are usually shown as dashed outlines.
The rim of the Near Side Megabasin, as proposed by the present author, is indicated by dashed lines, in the same manner as the other basins.
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