We found one dictionary that defines the word natural enclosures:

General (1 matching dictionary)

1. natural enclosures: Vocabulary.com

(Note: See natural_enclosure as well.)

Definitions from WordNet (natural enclosure) ▸ noun:  a naturally enclosed space ▸ Also see natural_enclosure ▸ Words similar to natural enclosures ▸ Usage examples for natural enclosures ▸ Idioms related to natural enclosures ▸ Wikipedia articles (New!) ▸ Words that often appear near natural enclosures ▸ Rhymes of natural enclosures ▸ Invented words related to natural enclosures