I've been working on a backstory for my Makuta recently (My favourite part ), and I have a couple ideas in the works. One of them I thought I'd bring to you to see if it fits the project. If it doesn't, that's okay, I do have other ideas. Here's the short of it:
Lots of island realms have been added for the project; I've invented a city instead. Anchredge Bay is a bustling city-port located on the northern tip of the Southern Continent, where it receives shipments from Stelt, the Northern continent from around the Peninsula, and, on occasion, even Metru Nui. Certain Matoran of Anchredge Bay are responsible for delivering these goods and shipments along the western shore of the Southern Continent (Stelt handles the eastern shore), through express waterways to their designated coastal settlements. Moreover, Anchredge Matoran utilize various inland routes that lead deep into the Southern Continent, and connect with the large cities to the west of Mount Valmai and the Deadlands that would later come to be known as Voya Nui. These inland routes are perilous, however, for the wooded hills and valleys south of the Northern Coast play host to dangerous Rahi, predatory outlaws, and, on occasion, even Dark Hunters. The Deadlands below this region are unsurprisingly desolate and harsh, and due to the nature of these conditions, Toa are regularly dispatched to accompany any necessary journeys these Matoran may make to the big cities. The seafaring trips are far safer, luckily, for the western coastline is continually monitored and surveyed, and the regular Matoran settlements along it are quick to alert. These seafaring voyages end at Kumo-Nui on the western coast (Makuta Avecious' Island, which lies just above the Tren Krom River), and Kumo Nui sub-distributes what remains to the nearby settlements.
(If you look at the canon map of the MU, it'll be easier to visualize. It's just to the left of the left-tip of Voya Nui, along the top ridge of the southern Continent.)
The Makuta I'm working on (Presently unnamed) oversees Anchredge Bay, and Anchredge Bay alone. There are several reasons for this unique situation.
Anchredge Bay, while a secondary port to Stelt, is still a key point of access to the majority of the Southern Continent, and thus, individuals such as the Dark Hunters and Barraki might be inclined to exploit this potential. The Barraki did so, in fact, and their initial capture of the City allowed their armies to expand quickly. Moreover, the Bay is isolated due to the surrounding wilderness to the south, and due to that region's foggy, dark nature, beings unfriendly to the MAtoran, and thus, MAta Nui's mission, have ferquently gathered there across history. It is for the relative importance, high poulation, isolated geography from the other northern settlements, and precarious position of Anchredge Bay that Makuta Miserix assigned my Makuta to the city alone, and another Makuta to the broader area of the north of the Southern-Continent.