Flag of Camuy (Aguadilla, Puerto Rico)

The green in the flag represents the vegetation and pastures of the municipality, the white wavy stripe represents the Rio Camuy river which goes through a cave midway through (as represented with the split down the middle), the symbol in the middle represents the Sun, which is named "Camuy" in the Taino language.

Source: https://www.crwflags.com/fotw/flags/pr-cy.html