|Administrative region||West Macedonia|
|• Municipal unit||314|
|Time zone||EET (UTC+2)|
|• Summer (DST)||EEST (UTC+3)|
Krystallopigi (Greek: Κρυσταλλοπηγή; Bulgarian: Смърдеш, Smardesh or Smrdesh, Macedonian: Смрдеш, Smrdeš) is a former community in Florina regional unit, West Macedonia, Greece. Krystallopigi means "crystal source". Since the 2011 local government reform it is part of the municipality Prespes, of which it is a municipal unit. The population is 383 (2001). The main village is also called Krystallopigi. After the Greek Civil War, the village was resettled with Aromanians from Epirus. Today they still form the majority of the towns population. Here is located the depopulated village Vambel.
Krystallopigi borders Albania to the west; Prespes municipality to the north; Korestia municipality, Kastoria regional unit, to the east and southeast; and Kastraki community, Kastoria regional unit, to the south. A major road border crossing into Albania is located here. The Albanian side of the border crossing is known as Kapshtica, 9 km east from Bilisht.
The village was mentioned in an Ottoman defter of 1530, under the name of Ismirdesh, and was described as having 53 households.  The bigger part of the population of Smerdesh in 19th and in the beginning of 20th century was Bulgarian. There were 1780 inhabitants in 1900.
Many residents of Smardesh took part in the struggle of IMORO. There was an illegal foundry and depot for hand grenades in 1903. The village was burned by Turkish troops and Albanian irregulars in May 1903. It was plundered and burned for the second time in 1903 during the Ilinden–Preobrazhenie Uprising.
The name of the village was changed to Krystallopigi in 1926. In 1951, the village was declared entirely uninhabited, and later Vlachs from Thesprotia and from the vicinity of Preveza were settled there.
- "Απογραφή Πληθυσμού - Κατοικιών 2011. ΜΟΝΙΜΟΣ Πληθυσμός" (in Greek). Hellenic Statistical Authority.
- Kallikratis law Greece Ministry of Interior (Greek)
- Harun Yeni, Demography and settlement in Paşa sancaği sol-kol region according to muhasebe-i vilayet-i rumeli defteri dated 1530 [1530 tarihli Muhasebe-i Vilayet-i Rumeli defteri'ne göre Paşa Sancağı sol-kol bölgesinde demografi ve yerleşim], Ankara, 2006, стр. 118.
- Brailsford, H. N. Macedonia: Its Races and Their Future, London 1906, p. 141
- Васил Кънчов. „Македония. Етнография и статистика“. София, 1900, с.265 (Kanchov, Vasil. Macedonia — ethnography and statistics Sofia, 1900, p. 265),
- Чекаларов, Васил. Дневник 1901-1903, с. 232 (Chekalarov, Vasil. Diary 1901-1903, p. 232)
- Силянов, Христо. Освободителнитѣ борби на Македония, том I, София 1933, с. 271 (Silyanov, Hristo. The liberation struggles of Macedonia, vol. 1, Sofia 1933, p. 271
- Brailsford, H. N., op. cit., p. 144-146, Македония и Одринско (1893-1903). Мемоар на Вътрешната организация, 1904, с. 203
- Шклифов, Благой и Екатерина Шклифова. Български диалектни текстове от Егейска Македония, София 2003, с. 32 (Shklifov, Blagoy and Ekaterina Shklifova. Bulgarian dialect texts from Aegean Macedonia Sofia 2003, p. 32), Македония и Одринско (1893-1903). Мемоар на Вътрешната организация, 1904, с. 203