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pala4833 t1_iydpls0 wrote

What's the significance of the bits that run outside the square?

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mushroomgnome OP t1_iyeidh9 wrote

The short answer is aesthetics.

The longer answer is its a technique found in a lot of older maps which maximizes the area of interest (in this case the Columbia River Watershed). By letting portions of the area of interest hang over the edge of the map, you can increase the scale without adding a ton of additional white space.

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