Thaana, Taana or Tana is the present writing system of the Maldivian language spoken in the Maldives. Thaana has characteristics of both an abugida (diacritic, vowel-killer strokes) and a true alphabet (all vowels are written), with consonants derived from indigenous and Arabic numerals, and vowels derived from the vowel diacritics of the Arabic abjad. Its orthography is largely phonemic. Asia's smallest and least-known nation, the Republic of Maldives, lies scattered from north to south across a 750-kilometre sweep of the Indian Ocean 500 kilometres south-west of Sri Lanka. More than 1000 islands, together with innumerable banks and reefs, are grouped in a chain of nineteen atolls which extends from a point due west of Colombo to just south of the equator.