The 1st Floor (第1層, Dai 1-sō?) of Aincrad is geographically the largest floor. It is almost completely circular with a diameter of ten kilometers (eighty square kilometers). The 1st Floor is roughly the same size as Saitama Prefecture Kawagoe City (population 330,000).
The main settlement on the 1st Floor is the Town of Beginnings, but there are also numerous other towns and villages on this floor.
Unlike the higher floors of Aincrad, the 1st Floor does not have a particular theme or dominant geography. As the starting location of all new players, the great expanse of the 1st Floor is quite diverse.
The Town of Beginnings is located on the southern end of the floor and rests over the edge of the floating castle. The metropolis encompasses twenty percent of the floor's surface area and is the focal point of the floor, featuring the teleport gate in the central plaza. The city wall forms a semi-circle to the north.
Grasslands surround the Town of Beginnings, and they are populated primarily by boar and wolf-type monsters. Worms, beetles, and wasp-type insect monsters also inhabit the grasslands surrounding the Town of Beginnings.
To the northwest of the Town of Beginnings, there is a deep forest region. The northeast is a lake region. Players must pass through either of the two regions before reaching a significantly more dangerous mountainous region containing ruins, valleys, and more difficult monsters.
The 1st Floor Labyrinth is located on the far northern edge of the floor. It begins at part of a large 300 meter wide by 100 meter tall tower that is a portion of the dungeon that leads to the 2nd Floor. This Labyrinth has twenty floors before the boss room on the 20th floor of the Labyrinth.
Though it is said that various small to medium sized towns and villages dot the landscape of the first floor, there are few that are really the most active, and notable.
The Town of Beginnings is the main settlement on the 1st Floor. It is the beginning point of all players and also the largest town in Aincrad. It is also where a majority of the non-players in «Sword Art Online» reside.
Tolbana is the second largest town on the 1st Floor, at approximately 200 meters wide. It is the closest town to the 1st Floor Labyrinth, only 30 minutes away from its entrance, and it is the site of the first «1st floor boss strategy conference». The town is lined with large windmills. Players first arrived at Tolbana three weeks after official service of SAO began.
Tolbana has several bars and restaurants, 3 inns, and a number of NPC houses. Kirito rented the 2nd floor of a farmer's house once for ten days. Tolbana also has several fountains and an amphitheatre-like meeting place. Its main plaza is known as «Fountain Square».
Medai is a village on the 1st Floor.
- «Frenzy Boar»
- «Little Nepents»
- «Large Nepents»
- «Ruin Kobold Troopers» (Labyrinth monster)
- «Ruin Kobold Sentinels» (Boss's minions)
- «Scavenger Toads»
- «Dire Wolf»
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