Tsekwon

Tsekwon is the linguistic predecessor to Modern Sekowan, the chief language of Sekowo. Tsekwon was spoken in Carcosa and the surrounding region during the 6th millennium BCE. It has been revived during the last decades and is now the official language of Sekowo with an estimated 17 million native speakers (most younger than 16) and some 80 million secondary speakers.

Phonetics
Tsekwon is phonetically remarkable on account of its large inventory of dorsal consonants. There is also a rich set of pharyngeal obstruents. In fact, there are a greater number of distinct phonemes in Tsekwon than in any other Terran language.

Sonorants
There are a number of sonorants as well:

Nasals
 * Bilabial: m
 * Labiodental: nv
 * Alveolar: n
 * Velar: ng

Laterals
 * Alveolar: l
 * Velarized: lh (dark "l")

There is also the rhotic retroflex /r/ and the semivowels /w/ and /y/, corresponding, respectively, to /u/ and /i/.