Karelian has seven vowel letters: A, E, I, O, U (the standard five), plus Ä (A with umlaut, front open vowel) and Ö (O with umlaut, rounded front mid vowel). Unlike Estonian, Karelian does not have Õ or Ü in the standard Karelian Proper orthography.
Karelian vowel harmony divides vowels into front (Ä, Ö, I, E) and back (A, O, U) groups, with harmony governing which vowels can appear in the same word. This is similar to Finnish vowel harmony and is a defining feature of the Karelian phonological system [3]. The 2007 orthographic standard captures this vowel system using familiar Latin letter conventions.
Karelian Proper has 19 consonant letters in the 2007 Latin orthography. The most distinctive are Č (palato-alveolar affricate, ch-sound as in "church"), which distinguishes Karelian from both Finnish and Estonian orthographies, and the sibilants Š and Ž.
Like other Finnic languages, Karelian has consonant gradation — the alternation of consonants between strong and weak grades inherited from Proto-Uralic. The Karelian Research Centre [1] has documented Karelian consonant phonology in detail, and the 2007 orthographic standard was designed to represent the consonant inventory unambiguously using caron diacritics for sounds without Latin equivalents.
Karelian Proper has five special characters: Č, Š, Ž (consonants with carons) and Ä, Ö (vowels with umlauts). The caron consonants are key orthographic markers that distinguish Karelian from Finnish (which uses none of these) and align it with Central European linguistic conventions used for similar sounds in Czech and Slovak.
The choice of caron diacritics in the 2007 standardisation [1] was deliberate — they are internationally recognised, easily reproduced on modern keyboards, and provide clear visual differentiation between Karelian and Finnish texts. The letter Č in particular marks Karelian texts as distinctly non-Finnish while serving the Finnic language's phonological needs [3], placing Karelian visually alongside Czech, Croatian, and Lithuanian in its use of caron diacritics.
Karelian uses Arabic numerals (0–9). The native Karelian number words: nol (0), yksi (1), kaksi (2), kolme (3), nelli (4), viizi (5), kuuzi (6), seičeme (7), kaheksa (8), yheksä (9).
Karelian number words are clearly cognate with Finnish (nolla, yksi, kaksi, kolme, neljä, viisi, kuusi, seitsemän, kahdeksan, yhdeksän) and reflect the shared Proto-Finnic ancestor. The characteristic Karelian sound changes are visible in numbers like nelli (4, cf. Finnish neljä) and viizi (5, cf. Finnish viisi), showing Karelian's distinctive phonological development.
A complete view of all 26 Karelian letters in the 2007 standardised Latin orthography. The Karelian Research Centre [1] and the Government of the Republic of Karelia [2] support the use and development of this standardised alphabet for all official and educational purposes.
The University of Eastern Finland [3] in Joensuu, situated in the historical North Karelia region near the Russian Karelian border, provides academic research on the Karelian language and culture. UEF's position on the Karelian linguistic and cultural border makes it ideally placed to study the relationship between Finnish regional varieties and the Karelian language of Russia.
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