Sasune is one of several kingdoms in Final Fantasy III and the one in which the game starts in. Sasune is split into two different regions: Inner Sasune and Outer Sasune. Inner Sasune holds the castle and three towns, along with two caves, while Outer Sasune seems to only hold the town of Canaan and Mt. Jenora.
Identified as the "windy city Ur" in the "Legend of the Eternal Wind" album, Ur is the first town that the party visits. In the famicom game, all four orphans come from this town. In the remake, only Luneth and Arc were raised here.
Ur is generally a small town of the "everybody knows everybody" sort of way. In the remake, numerous townsfolk address Luneth by name and mention Arc. The village has three elders: Elder Dahn, Elder Homak and Elder Topapa. Of the trio, Topapa gets the lion's share of focus, being the one to talk to the kids/Luneth about their destiny. There is also Nina, the boys' adopted mother.
Despite being the first town, Ur is not totally safe. The town has a storeroom in the back that has monsters on the route towards it. Final Fantasy III occasionally has spots in towns where encounters can happen, although they're not as frequent as the game makes them out to be.
Ur doesn't have much industry. The elders do seem to heed the crystal; An unused sequence for the E3 demo has Topapa send Luneth to investigate the Crystal after the earthquake. The town also has a significantly larger shrine compared to the other crystal locations. Perhaps it's a religious town?
Kazus is a town neighboring Ur to the south. By the time the game begins, the Djinn has been released from the Sealed Cave and has inflicted a curse upon the town, turning all of the residents into ghosts: people that are only outlines and can do nothing. Amongst the residents is Cid Haze, an airship inventor from Canaan who was visiting when everything went down. Cid tells the party that his airship is buried beneath the desert and the kids set out to stop the Djinn. In the remake, Arc joins the party in Kazus and another party member, Refia, is the adopted daughter of the local blacksmith, Takka.
Kazus has a bit more directly going for it compared to Sasune. It was established at the foot of a mountain where a mine was created. This mine is home to mythril, which Takka uses as his primary building materials. One could speculate that Kazus is the distributional powerhouse of Sasune, as mythril is generally used as a metal that is conductive to magic.
Castle Sasune is the home of the royal family of the kingdom. Prior to the beginning of the game, the Djinn's curse also struck the castle, turning almost all of its soldiers, staff and even the king into ghosts. The only one who can break the curse, Princess Sara, has gone missing. Fearing the worst, the king sends the Warriors of the Light to find Sara.
In the famicom version, a lone soldier was sparred the curse due to being away at the time. The remake turns this soldier into Ingus, the fourth and final party member.
Castle Sasune is the first castle in Final Fantasy to drop the Dragon Quest-esque design of castles (flat with heavy focus on the interior) in favor of a more distinctive style. The castle is broken into two sections: The exterior, allowing the party to run around the castle's inner bailey and access the various towers or keep, and the interiors which, building off of a particular part of Final Fantasy II, now feature hidden areas with oddles of items. This style would be retained for the remainder of the 2D era.
The castle's design varies over its many appearances: In the original game, its design was derivative of that of Castle Cornelia from Final Fantasy I (as were Fynn and Palamecia in earlier versions of FFII). Interestingly, the Final Fantasy III remake would retain this design for the overworld, though it should be noted by that point, the castles that shared that design (Cornelia, Fynn and Palamecia) all got new designs, though Cornelia's was based on its old design and thus still retains some familiartiy. The 3D remake's CG introduction reimagines the castle greatly; The castle now being two large sections connected by a middle section with numerous towers on either side and foliage around it. The manga instead gives the castle a distinct aesthetic remeniscent of Amano's artwork and leans into that in lieu of the dual towers.
In terms of layout, the castle itself boasts a keep and two towers behind it. The Keep itself contains the throne room, numerous beds that the party can sleep in and an underground lake where Sara throws the mythril ring to end the Djinn's curse. The right tower seems to be a residential area, as it's not only safe, but also features Sara's bedroom at the top. The left tower, however, is filled with undead monsters. At the very top is the Wightslayer sword alongside a griffon to guard it.
The soldiers of Castle Sasune generally hold Red Mages in high regard, with one soldier even saying that it is every soldier's dream to become one and the Wightslayer being one of few swords Red Mages could equip in the original game. NTT guidebooks for the Famicom game suggest that Red Mages feature heavily in the kingdoms history to the point where it used to be customary for Red Mages to ascend to the throne. The remake reflects this via Ingus, being a soldier of Sasune, using the Red Mage job in the opening cinematic.
The soldier outfits vary between versions: The Famicom version was a bit vague on whether it was armor or a uniform. The remake turns it into armor while the Pixel Remaster version portrays it as an uniform. Ingus' outfit also shares some vague similarities to fellow soldiers' uniforms, but its unclear if his uniform is custom or if he is wearing what basically amounts to "casual wear" for him. Meanwhile, the manga portrays the Sasune soldiers outfits as uniforms.
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Additionally, the Famicom and 3D versions has differing shades of color for the soldiers either being pure blue or blue and red (red helmet and shoulderpads in the remake). The Pixel Remaster makes all of the Sasune guards' outfits blue.
Lastly: The sigil. In all three versions of FF3, Sasune uses a bird creature as the sigil on their emblems and banners. The remake also throws in carpets that resemble the sun. The manga has no visible sigils or banners around the castle itself, although the guards have a crosss badge on their left breast.
Canaan is the fourth settlement in Sasune and the only one located in "Outer Sasune", the area outside of the Parmeni Mountains. Compared to the towns in Inner Sasune, Canaan immediately stands out due to the presence of water, with both canals and fountains throughout the town. The town also has cobblestone pathways, giving it a more polished look.
There are two primary points of interest in Canaan: Cid's House and Salina's House. Cid's House is located in the back of the town. The primary area is regular enough, but if the party gives Mrs. Cid an elixer, Cid will allow them to enter his old airship hanger underneath the house. The does raise the question of how Cid gets the airship out of the hanger. A hatch nearby, perhaps? Meanwhile, Salina's house contains her and her mother, both affected by Desch's underexplained departure.