Gyalsumdo (ग्याल्सुस्दो) is a mostly undocumentedTibetic language spoken by an estimated 200 individuals of theManang District in theGandaki Zone ofNepal.^[2][3] In January 2018 the language was added toISO 639-3 under the code "gyo."^[4]

Gyalsumdo is atonal language; however in Gyalsumdo, unlike most otherCentral Tibetan languages, the word, rather than the syllable acts as thetone bearing unit. The language is reportedly closely related to the nearbyNubri andTsum languages which share a large proportion of vocabulary.^[2] Gyalsumdo is also described as being somewhatintelligible by speakers ofNar-Phu.^[5]

There are 30 consonants in Gyalsumdo, which are summarized in the table below.

		Labial	Dental	Post- alveolar	Retroflex	Palatal	Velar	Glottal
Plosive	voiceless	p	t		ʈ	c⟨ky⟩	k
	aspirated	pʰ⟨ph⟩	tʰ⟨th⟩		ʈʰ⟨ʈh⟩	cʰ⟨khy⟩	kʰ⟨kh⟩
	voiced	b	d		ɖ	ɟ⟨gy⟩	ɡ
Fricative	voiceless		s	ɕ				h
	voiced		z	ʑ
Nasal		m	n			ɲ	ŋ
Rhotic	voiceless		r̥⟨rh⟩
	voiced		r
Lateral	voiceless		l̥⟨lh⟩
	voiced		l
Semivowel		w				j⟨y⟩

There are five places of articulation for vowels.

	Front	Mid	Back
High	i  iː⟨ii⟩		u  uː⟨uu⟩
Mid	ɛ⟨e⟩  ɛː⟨ee⟩		ɔ⟨o⟩  ɔː⟨oo⟩
Low		a  aː⟨aa⟩

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