Click the image to see the map.

The map's 1,050 m², or 1.05 km². That's the size, roughly, of Merdeka Square in Jakarta, Indonesia, courtesy of Wikipedia.

It's also about 30% of the size of Central Park in NYC, which is 3.41 km².

Dusken Keep's immediate outskirts are around 200,000 m², which is roughly the size of the Cultural Square in Changchun, China.

Really puts things into perspective, eh?

Cats provide distances, in meters, in which sprites are detected. Three cats provided a total of 316 m of this.

I moved Horbir around until going North one step stopped showing the sprite on the map, then moved back South until it reappeared. After zooming in and out a bunch of times, and scaling, here’s the result.

This excludes internal areas like Trials and is an estimate. Notice how some squares overlap slightly, or go a bit over the edge, or miss some small gaps. This, probably, all evens out in the end, anyway.

3/29/20: Removed erroneous green square, changed values accordingly.
5/11/20: Math's wrong. Gotta fix.
5/12/20: Fixed math, changed colors, blurred background, rearranged text here.
5/26/20: Fixed broken image. Weird. Fixed sections.
9/14/20: Overworld area is unchanged, the versioning info in the description has been updated to reflect this.