We’re here to help you solve. What topics are on your list of crossword-solving weaknesses?

This Wordplay series takes a look at topics you might be fuzzy on that come up frequently in crossword puzzles, so that the next time you wonder which European river runs through Orsk (it’s the Ural), you’ll be able to fill it in with confidence.

We’ll also show you ways these names might be clued, so you’ll be able to recognize them the next time they come up. The clues that involve wordplay meant to trick you are bold, to make them easier to spot and so you can learn to think like the puzzle makers.