I was born and currently live in Tierra del Fuego. AMA
But the only main road is at the top of that border, and that's a hard border. You have to cross that border to go from the island to mainland Argentina, across Chile. It's a pain everytime, and it affects life very much.
I live on Argentina side. People on each side feel Argentinian or Chilean, they talk a different accent as soon as you cross the border.