England is not an island. It’s a myth. The rest of Europe just didn’t want to be associated with it, so they all pretend that continental Europeans can’t just walk over. England goes along with it because it’s racist. There was an old English king who was fed up with wars with France, who started the myth to see if it stopped his french cousins from claiming the crown. This is also why there’s a big white stripe down the middle of the French tricolour: it represents the white cliffs of Dover Calais but most people have forgotten. The channel is essentially a big puddle but only around the edges. All those ships are flat at the bottom with wheels on them. That’s why the French call it the sleeve; it’s deep enough in places that an average sized adult might get their sleeves wet if they did try to walk across some parts. The story was so successful that the Spanish launched an armada not knowing that their ships with round bottoms would flounder as they got close to England and they all hit the rocks under the water and so never made it.