Spot the wrong pair.

Answer: Danube : Asia is the wrong pair.

Explanation: Each pair lists a river and a continent; check where each river actually flows.

• Rhine — Europe. The Rhine originates in the Swiss Alps and flows through countries such as Switzerland, Germany and the Netherlands.

• Thames — Europe. The Thames flows through southern England, including London.

• Nile — Africa. The Nile flows north through northeastern Africa (for example, Sudan and Egypt).

• Danube — Europe (not Asia). The Danube flows across Central and Eastern Europe through countries such as Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova and Ukraine.

Quick tip: To spot the wrong pair, recall or look up the primary continent a river flows through.