Naqadeh (Persian: نقده‎‎, Azerbaijani: Sulduz - سولدوز, also known as Naqadeh, Naghadeh, Naghdeh, and Nagadeh; formerly known as Sulduz, Sool Dooz) , also Romanized as Sulduz, Solduz and Suldoz) is a city in and the capital of Naqadeh County, West Azerbaijan Province, Iran. At the 1996 census, its population was 110,257, in 20,781 families. The city is located in the Gadar River valley, 23 kilometres (14 mi) south of Lake Urmia at an elevation of 1,300 metres (4,300 ft) above sea-level. The region's economy is based on agriculture, particularly the production of fruit, grain, and timber.