Ingame we once get a full map of Kivitos, which is literally just a map of Europe if you look closely
Shiroko in her momo also says it would take months or years to fully travel around Kivotos, and even when she biked around it she didn't go all the way around, she just did a highway tour.
Kivotos we know covers tropical, islands, volcano, Arctic, and every single terrain
But one retard here spends every thread trying to gaslight people that Kivotos is only the size of Dallas
The reason it's called a city is just a reference to Raildex, since the devs say BA is based off Raildex and Type Moon stories. But the devs say that normal terms from our world don't mean the same thing in BA. They talk about how A sensei doesn't mean "a middle aged man that teaches classes" but rather "a complete person who already texted their answer". Terms in BA aren't often the same as Earth. The game makes it clear it's not the size of a city