|Rural District||Reza Mahalleh|
|Time zone||UTC+3:30 (IRST)|
|• Summer (DST)||UTC+4:30 (IRDT)|
Kaldarreh-ye Sofla (Persian: كلدره سفلي, also Romanized as Kaldarreh-ye Soflá and Kaldarrehsoflá) is a village in Reza Mahalleh Rural District, in the Central District of Rudsar County, Gilan Province, Iran. At the 2006 census, its population was 304, in 100 families.
- Iranian National Committee for Standardization of Geographical Names website (in Persian)
- "Census of the Islamic Republic of Iran, 1385 (2006)". Islamic Republic of Iran. Archived from the original (Excel) on 2011-11-11.
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