At least back when I set up the provinces the (two) wikis were confusing and contradictory. I ended up using the primary sources, the books, to find the scarce information that exists.
At some point in time a glossary was put online by Sapkowski. One guy, Miki, has been editing this information, that is only available via Wayback Machine, into the wiki over the last few years. I had a hard time, though to access the section about geography:
http://web.archive.org/web/20000618033502/http://sapkowski.fantasy.art.pl:80/wc/index.html.po
Long text, point being: Don't fully frust the wikis.
To further illustrate my point all the information from the books about Mag Turga (only mentioned in the Tower of the Swallow). Not all too specific, actually:
'I think Your Majesty should marry the girl that we keep in Darn Rowan. We need this marriage, the legality of the sovereign lordship of Cintra, the calming of the Skellig Islands and the insurgents in Attre, Strept, and Northern Mag Turga. We need a general amnesty, peace in the hinterlands for the supply lines... We need the neutrality of Kovir's king, Esterad Thyssen.'
This was because Riedbrune lay at the mouth of the Dol Newi Valley, along the Theodula Pass that cut through the North Case of the Amell Mountains, and next to Riverdell, which associated with countries that had long been Nilfgaardian subjects – Mag Turga, Geso, Metinna, and Maecht. The town of Riedbrune, he explained, was the last city in which the settlers could still rely on something more than themselves, their wives and whatever they had in their wagons.
'The iron ore is washed here,' said Angouleme while pointing. 'Over there it is brought out in the tunnels of the mine. They feed material there, pouring it into the troughs where it is washed with water from the stream. The ore is deposited in sieves, where it is separated out. There are many such mines and filtration camps around Belhaven. But the ore is then moved into the forested valleys, like the Mag Turga, because wood is needed for the furnaces and smelters...'
'The landscape of Hundredlakes', Vysogota said, 'is now Mil Trachta. It is very broad, sliced through by the Yelena River, which cuts through lakes in the northern part of Metinna, near the border of Nazair and Mag Turga. Buyvid Backhuysen writes that they travelled south to the lake from Assengard... Today Assengard is no more, only its ruins remain and the closest town is Neunreuth.
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