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http://spatialreference.org/ref/epsg/4269/

That link shows the area that the North American Datum 1983 covers and one thing I note is that it doesn't cover North America. It covers all of Asia and Europe and north Africa but not Europe. Why is this?

screenshot

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This is a rendering error in the spatialreference.org website and a common issue for GIS software.

The stated longitude extent covers from -52 to +172. This should actually be -52 to -180 and +180 to +172 since the datum extent crosses the -180/+180 International Date Line.

You'll also notice the same issue for Russian datums, such as Pulkovo 1942.

(Side note; the International Date Line does not follow the 180 degree meridian exactly.)

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