A few singular nouns will take on a different ending, -у / -ю, when they are used describe a place or location. For example:
Not a location: -е / -и | Location: у / -ю |
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Они мечтали о снеге. aNEE michTAli a SNYEgye They were dreaming about snow. | Они валялись в снегу. aNEE vaLYAlis f sniGOO They were rolling in the snow. |
Валя рассуждала о рае и аде. VAlya rasooZHDAla a RAye i Adye Valya thought about paradise and hell. | Валя почувствовала себя в раю. VAlya paCHOOstvavala siBYA v raYU Valya felt as if in paradise. |
For a list of these words, and more examples, check out our post on using prepositional case to describe locations!