I tried to name the areas a little bit, as I find all this S/N/E/W very boring and unclear,once we grow a bit more. feel free to use, or ignore, whatever fits your style.
Lake Shangia (The Southeastern Peninsula)
I still feel there is not much room for discussion here, each placements has its drawbacks and the one suggested by Wotan seems to fit our medium term goals best.
Cape of Good Hope (The Southwestern Peninsula)
I tried to fit in four cities here, but it always looks crowded. I think this is less a problem with horse towns placement, but a general shortage of space.
Yellow B has the advamtage of making use of the forest chops, as the downside we need culture too reach the Oysters.
Kalahari Desert (The Northern Plains/Hills/Deserts)
I put in some town here to, but I believe them to be rather low priority. ALthough it would be good to settle these spots before the AI gets into Settler Frenzy, and puts small unsurportable size 1 towns ebverywhere which needs to be conquered for no gain.
Settling the desert itself is not covered, as I assume, once it comes to that we will have a completely new core to settle.
The Bridge of Dreams (I guess you which one this is)
Just a placement for later, to setlle all the available area and have some breakthroughs for our ships. Apart from maybe the first and last town, none of these has any priority until the MA probably.