1) Alabasta isn't stated to be an island. It's stated to be
on an island.
And no. You're acting like Alabasta is the average island. Literally every single island we've seen that we have ways to find out its size is smaller than Alabasta.
Skypiea, smaller than Alabasta. Zou, smaller than Alabasta. Punk Hazard, smaller than Alabasta. Jaya, smaller than Alabasta. Every island in Totto Land, smaller than Alabasta. Thriller Bark, smaller than Alabasta. Marineford, smaller than Alabasta. Cactus island, smaller than Alabasta. Onigashima, smaller than Alabasta.
Alabasta's
river is larger than the height of the
atmosphere up to
Skypiea. It's larger than the Red Line.
Literally every single island we've seen is smaller than Alabasta. Most of them are even smaller than Alburnia alone, much less the river, much less the entire island.
2) A continent and an island have no correlation in size. Antarctica is an island. Australia is an island. Any body of land fully surrounded by water is an island.
3) Yeah, which is why they call it "Eurasia". They share a tectonic plate and they also share land. The only reason why they aren't considered a single continent is because of things like their
collective culture, not because of their sizes.
4)
Canon statement. Don't get smart. They have no individual names because we haven't explored them. They have their own seasons. Their own heights. Their own widths.
5) It was considered to be a big deal because
someone broke it in half, not because it was ridiculously large to the point where Sandy Island looked up to it. That's like me saying Kaidou lifting Onigashima is serious in the series because it's an island. It's serious because
Kaidou lifted it.
6) "The fact is that a continent is bigger than an island".
One Piece's planet isn't our planet. We don't have greenland, australia, russia, any of those. We have our own bodies of land.
So the real world continents being bigger than islands do not mean jack shit to this completely different planets.
"Continents are bigger than islands".
1. Continents can be islands.
2.
Our continents are bigger than
our islands. That does not correlate into a completely different planet.