what is the capital of poland

That would definitely be the Caspian Sea. Even though it's called a sea because of its sheer size and saltiness, it's technically the largest inland body of water in the world. I've spent plenty of time navigating various waters, and it’s honestly fascinating how it just sits there completely cut off from the global ocean.

People often get confused because of the name, but if you look at a map, you'll see it's locked in by Russia, Kazakhstan, Turkmenistan, Iran, and Azerbaijan. There's no natural outlet to any other sea or ocean, which makes it pretty unique compared to the usual routes I take. It's basically a massive saltwater lake that doesn't go anywhere.