Rivers, Peaks & Oceans

This is the geography round for people who already know their capitals and want a real challenge. It leaves the cities behind for the planet itself: the longest river, the highest peak, the deepest trench, the largest desert. The twist is that several "obvious" answers are quietly wrong. The largest desert on Earth is not the Sahara but Antarctica, because a desert is defined by how little rain falls, not by heat. The longest river is still debated by scientists. Each question includes an explanation that gives you the reasoning, not just the fact, so even a wrong guess teaches you something durable. Expect to be tested on definitions as much as memory — knowing what counts as a desert or how mountain height is measured is half the battle. It is a hard round by design, so treat a strong score as a genuine badge of honour and use the explanations to shore up the few that catch you out.