Final answer:
The harsh winter conditions and the vastness of Russia were the two geographic features that caused Napoleon's invasion to fail.
Step-by-step explanation:
Two geographic features of Russia that caused Napoleon's invasion to fail were the harsh winter and the vastness of the country. The harsh winter conditions were a major challenge for Napoleon's troops, as they were not properly equipped or trained to withstand the extreme cold temperatures. The vastness of the country made it difficult for Napoleon's army to maintain supply lines and communication, leading to logistical issues and weakening of their forces.
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