Claire of Anggarrgoon has a post on the Papuan language Diuwe, about which the Ethnologue entry says only “below 100 meters.” The code for the language being DIY, Claire thought a fuller description of the language would make a good “DIY effort”:
Therefore let me start the ball rolling by claiming that DIY is the only language which supports the hypothesis that altitude affects air stream mechanisms. Its consonant inventory contains 3 stops, four fricatives, 5 laterals, six approximants and seven vowels.
Hidbap is Diuwe’s closest neighbour both geographically and phylogenetically. It is a language spoken above 100m but below 200m in the same area as Diuwe, that is, 12 miles southwest of Sumo, east of the Catalina River. Like Diuwe, it has exactly 100 speakers. The languages are quite closely related, though there is no mutual intelligibility due to the presence of a large bundle of isoglosses at the 100m isoline. This bundle of isoglosses is largely due to the fact that speakers of either language avoid crossing into each other’s territories at all cost…
There is much more, ending with a call for other language bloggers to “enlarge our sample of altitude-affected inventories to get a better view of the phenomenon.” Alas, I’m up to my ears in actual work at the moment, but I hope others will rush in where Foley1 fears to tread!
1Foley, W. A. The Papuan Languages of New Guinea. Cambridge: Cambridge University Press, 1986.