So far the thread attends the northern edge of the 2024 Greyhawk map, to understand the meaning of its latitudes, and who the ethnicities are that inhabit these latitudes, plus the ethnicities who live farther north beyond the map.
For me a surprise is how populated the lands are that are north from the 2024 Greyhawk map, essentially everything going on across the latitudes that are north from Ireland.
At this point, the thread can attend the western edge of the 2024 Greyhawk. The latitudes of Baklun can also surprise.
The continent is Oerik. Baklun is the westernmost region of the Flanaess subcontinent. South of Baklun is Suel. Together, 2024 Greyhawk identifies them as Western Flanaess. From the 1983 latitudes map that maps out these two regions, we can see all of the boundaries of the subcontinent of Flanaess.
Geographically, Baklun is sometimes the Baklunish Basin, presumably a river basin that collects the streams from the surrounding mountains. A large sea wedges from the north into the heart of Baklun. Greyhawk fandom calls this sea the Gulf of Ghayar (but I am unsure of the names canonicity in Oerth traditions).
D&D Greyhawk traditions from 1980 on portray Baklun as somewhere in Asia. In some ways the identity is specific, the "sultans" and "pasha" are the reallife religion of Islam with its reallife Muslim-majority ethnicities. On the other hand, these are imperialist titles that could be ruling over lands anywhere. Thus the reference remains vague.
The term sultan is Arabic, literally meaning "control", whence an Islamic governmental authority, and applies to various Islamic governments around the world. It approximates the meaning of a monarch, whether of an empire or a local region, but specifies an Islamic ruler whose lineage doesnt descend from the emperor (khalifa). A sultanate might be anywhere.
The Arabic term khalifa (English caliph), literally meaning a succession, specifies an Islamic emperor who descends from Muhammad. More than one have existed simultaneously in reallife history. Thus even the title caliph appearing in Greyhawk, would not necessarily specify a location.
The Islamic title pasha specifies the Ottoman Empire of reallife Turkiye (Turkey). Note there is a similar sounding Persian title for a monarch, padeshah, however the term "pashalik" can only be Ottoman. A pasha is an Ottoman title for a military commander, whence the assignment to serve as the governor of a conquered imperial province. Because of the imperialism, the province might be anywhere. In reallife, the Ottoman provinces are all west of the Caspian Sea. However, in a fantasy setting, a what-if scenario can locate an Ottoman province anywhere, and it might be an exclave that lacks territorial contiguity with the rest of the empire. Thus the title pasha cannot specify a location.
With the above in mind, here are the latitudes of Baklun itself. Its spans from 20° latitude to 50° latitude. The cities of Zeif, Ekbir and Selmur (Tusmit), are roughly around latitude 45°.
Here is a map of reallife Asia. The areas in red are the latitudes that correspond to those within the 1983 latitude map above. The area between the red areas corresponds the latitudes of Baklun itself. These are candidates for the many Baklun ethnicities.
In reallife history, Muslim empires extended rapidly across Asia. Here is a simple map showing areas of Asian Islamic imperialism in year 632 CE.
The Muslim empires expanded from Saudia, Iraq, and Turkey into western China. Plus exclaves managed to take hold in Myanmar and Malaysia into Indonesia. Note, the Islamic Turks who conquered what is today Turkiye derive from central Turkmenistan south from southwest Kazakhstan. Roughly comparable, the rise of Islam corresponds the early medieval period, while the Ottoman Empire of Turkiye corresponds the renaissance period.
In the earlier map, Baklun corresponds the area of Asia between the red areas, while the references to the sultans and pasha correspond to somewhere in the Islamic areas above. With regard to the 2024 Greyhawk map, the cities of Zeif, Ekbir and Selmur (Tusmit), are roughly around latitude 45°, across Asia. Note, as the D&D Oerth traditions understand it, Baklun doesnt include China (Celestial Imperium), nor Saudi Arabia (Erypt).
If one looks north from Mongolia, one can see Lake "Baikal". Despite being north from the 1983 latitude map, I suspect this important lake inspires the name "Bakl-un", as Gygax peruses a reallife atlas while thinking about Flanaess. This lake and the Altai Mountains east of Mongolia are part of a wide swath of Asia famous for its Indigenous shamanism. Not all of Baklun is Muslim monotheism. Much of it is the local Indigenous Asian religions, including animism, various forms of Buddhism, and probably Hindu and Daoist styles of polytheism.
With references to Turkiye in the west and north from Mongolia in the east, Baklun potentially represents the full span of the continent of Asia. Meanwhile the latitude 45° corresponding Kazakhstan may be relevant to understand the cities of Zeif, Ekbir and Selmir. Perhaps the title pasha relates to Turkmenistan south of it, if not from Turkey itself.
Even so, caution about location is necessary. The Muslim rulers may correspond these Muslim-majority areas. However, if conquerors of Zeif, Ekbir and Selmir, the citizens of these cities may be Nonmuslim Indigenous Asians elsewhere.