Cuna is spoken on San Blas Island, Panama, and
on the Caribbean coast astride the Panama/Colombia border.
All vowels may occur long. The voiceless stops and the
affricate are, from a morphological point of view,
geminates. Other consonants, except /w/, actually occur
geminated. Syllable canon is (C)V(C), i.e. no more than
two adjacent medial consonants can occur.

Sherzer, J. 1983. Kuna Ways of Speaking: An Ethnographic
Perspective. University of Texas Press, Austin.