Okay, we're working out the size of the Northern Continent utilizing the Atlas of Pern, because something is wrong with me. We won't be going whole hog, I am literally cutting up the Northern Continent into six parts (High Reaches regions, Tillek's peninsula, Fort's regions, Ista's regions, the Nerat Peninsula region, and everything the fuck else), leaving out the northernmost part of the map up past the likes of the Weyrs and Crom because nobody fucking lives there, maps are annoying, and the end goal is to get a decent read on the arable land of the Northern Continent as compared with how many people you need to run the Weyrs.
In the interest of transparency, I am telling you now that I am not being exact with my measurements, but the way I am cutting things up not removing areas of water should account for the areas of land that I am otherwise not accounting for.
200 miles on this map equals 379 pxls, so we'll be working off that...
Fort region- 386 x 515 x 302 x 239
Tillek Region- 448 x 138 x 79 x 468
Nerat Region- 257 x 465 x 336 x 661
Ista Region- 292 x 176 x 297
High Reaches Region- 263 x 481 x 154 x 712
Fort region- 204 x 270 x 158 x 126
Tillek region- 236 x 72 x 42 x 246
Nerat Region- 134 x 244 x 176 x 348
Ista Region- 154 x 92 x 156
High Reaches Region- 140 x 254 x 82 x 376
Fort Region- 37,446 sqmi (96,984 sqk)
Tillek Region- 17,352 sqmi (44,941 sqk)
Nerat Region- 73,080 sqmi (189,276 sqk)
Ista Region- 6808 sqmi (17632 sqk)
High Reaches Region- 74,072 sqmi (191,845 sqk)
Other- 164,004 sqmi (424,768 sqk)
Again, I'm being very inexact to allow for land areas that are too finicky for me to properly account for, so none of these are truly accurate to the landmasses I'm measuring (especially Ista, poor fucking Ista, more like 4/5 of that number), but I'm leaving out enough landmass that this final should be close enough to accurate.
Northern Continent- 372,762 sqmi (965,449 sqk)
So so far as the Northern Continent, seems like we're looking at something about Egypt-sized in total, a little smaller in actual area people use.
Now, I said above we're looking more at comparing this with my 'supporting a Weyr' numbers from this post, and for that we've got to look at shit like farmable land. I've stated elsewhere, I think given how mountainous the place is we can probably safely cut 3/5 of the landmass as 'unsuitable for farming'. Probably a little much, but it's easier than trying to account for what can grow at what elevation and in how much rock.
So, with that we get a number of 149,104 sqmi (386,177 sqk). Which is all well, all good, except now we have to convert that to acres to better work with our numbers from before. Which gives us a total of 95,426,560 acres in the Northern Continent suitable for our purposes.
Now, for the purposes of this math, I'm pulling out two different numbers. The first is our midline estimate for a minimum civilian population and acreage to support a single Weyr.
Midline Minimum- Pop: 38,794; Space: ~173k acres
The second we'll be assuming that supporting the Weyr takes a lot less of the workpower going into things. The number up there assumes that half of all able-bodied non-farmer adults are focused on supporting the Weyrs so far as their profession. For this second number we're going to go for a more realistic minimum, I think. Namely a 'tithe', historically, is supposed to be a tenth. Tenth of worth, tenth of labor. So, we're going to get another set of numbers with the goal of having 10% of the abled, non-farming adults focused on Weyr support. This will, hopefully, better better imitate what's needed with proper tenth tithes.
Doing that we end up with 52,315 farmers working 511,573 acres to support 237,941 people (plus the Weyrs), who we're estimating would require 304 acres of space themselves. So, add in the space needed to supply the food for the Weyr and we get an adjustment of-
Tithe Adjusted Minimum- Pop: 237,941; Space: ~910k acres
So, looking at the space required, the Northern Continent could theoretically support-
Midline Minimum- 551 Weyrs
Tithe-Adjusted Minimum- 104 Weyrs
Although we should also consider that once you get into a Pass you're going to be trying to minimize the space you use, but even if we said that folks can only farm a tenth of their normal land during a Pass, that would still be enough to support 10 Weyrs and a viable civilian population at minimum with our numbers.
Though of course this only take into account the number of acres farmers would need to farm to support the population, with the tithe-adjusted numbers then they could farm three times the land needed to support the population.
Tithe-Adjusted w/Farmer Max Holdings- 57 Weyrs
With our 'tenth farming capability' low estimate for a Pass bringing us to 5 supportable Weyrs for the continent. So hey, depending on what the actual numbers are for a Pass Anne may not have been off, especially considering that we're using an average multiplied by the number of Weyrs and some Weyrs should need less that others. Also people would have been far better fed and prepared on average, since we're talking farming 3x the space you need for the population.
Moving away from potential Weyr Numbers, we can use these numbers to give us an minimum estimate of the Pern population.
Midline Minimum Northern Continent Pop- 232,764 (261,300 w/Weyrs)
Tithe-Adjusted Minimum Northern Continent Pop- 1,427,646 (1,456,182 w/Weyrs)
Feel like I should add here, our estimated workable land is a bit larger than Japan, which in the early 1400s had a population estimated around 9 million, so I think we can safely say a 1.4 million minimum would likely be doable so far as food production for Pern. The big concerns really are management during a Pass and making sure there's space for everyone to be safely indoors during one, which actually shouldn't be that hard if you're thinking ahead, which this planet has had plenty of time to work out construction norms.
And because I'm still aggravated by one fucker I came across on a forum years ago, assuming a 10% appearance rate (I don't know what the estimate is nowadays)-
Midline Minimum Queer Pop- 26,130
Tithe-Adjusted Minimum Queer Pop- 145,618
And before anyone asks, even with the lower midline number there's only just few enough fuckers for them to all go to the Weyrs, and even then the Weyrs would have to be made of 92% queer peeps.