Can you claim land on Mars?

Excuse me, I was just reading about the latest advancements in space exploration and I came across something intriguing. Can you actually claim land on Mars? I mean, I know it's not like purchasing a plot of land on Earth, but is there any sort of legal framework or international agreement that allows individuals or corporations to lay claim to territory on the Red Planet? I'm genuinely curious to know if this is something that's actually possible or if it's all just speculative fantasy.