[eriaywxa] Ambiguous latitude and longitude

Drop the plus or minus signs of latitude and longitude coordinates (or the designation of which cardinal directions).  Which points are unambiguously not over ocean?  That is, of the 4 possible disambiguations, only 1 is not over ocean.  What is the most ambiguous point, as defined by human population density?  That is, of the 4 possible disambiguations of a point, which point has the highest second most dense point?

Inspired by the map of points with both antipodes on land.