We found 3 dictionaries that define the word upper regions:

General (3 matching dictionaries)

1. upper regions: Oxford Learner's Dictionaries
2. upper regions, the upper regions: Collins English Dictionary
3. upper regions: TheFreeDictionary.com

Phrases: upper regions of space, more... ▸ Words similar to upper regions ▸ Usage examples for upper regions ▸ Idioms related to upper regions ▸ Wikipedia articles (New!) ▸ Words that often appear near upper regions ▸ Rhymes of upper regions ▸ Invented words related to upper regions