25,000 (1991 SIL), decreasing. Ethnic population: 35,000–40,000 (1991 SIL).
Southeast Maluku Province, 35 villages. Tannembar islands; east coast Yamdena island, down to north tip of Selaru island. Latdalam village, southwest Yamdena.
North Yamdena (Nus Das), South Yamdena (Nus Bab). A chain of related varieties from north to south with 90% lexical similarity between extremes, but with morphological and phonological differences. Southern dialect thought more prestigious. Lexical similarity: 90% among the north and south dialects, 47% with Fordata [frd].