There are a number of Khuzestani Persian dialect

Dialect

The term dialect is used in two distinct ways, even by linguists. One usage refers to a variety of a language that is a characteristic of a particular group of the language's speakers. The term is applied most often to regional speech patterns, but a dialect may also be defined by other factors,...

s unique to the province of Khuzestan in southwestern Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

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There are two main regional classifications, in addition to less common varieties:

Northern region

• Behbahan
  Behbahan
  Behbahan is a city in and the capital of Behbahan County, Khuzestan Province, Iran. At the 2006 census, its population was 99,204, in 24,204 families....
  
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• Dezfuli
  Dezfuli
  Dezfuli and Shushtari is a Persian dialect spoken in Dezful and Shushtar two adjacent cities of Khozestan province in Iran. Dezfuli is closely related to the dialect of Shushtar.In fact Desphili and Shushtari have no significant difference aside from accents...
  
  
• Masjed Soleiman
• Shushtar
  Dezfuli
  Dezfuli and Shushtari is a Persian dialect spoken in Dezful and Shushtar two adjacent cities of Khozestan province in Iran. Dezfuli is closely related to the dialect of Shushtar.In fact Desphili and Shushtari have no significant difference aside from accents...
  
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These are generally unintelligible to speakers of Standard (Modern) Persian

Persian language

Persian is an Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan, Tajikistan and countries which historically came under Persian influence...

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Southern region

• Abadani
• Ahvazi [note orphaned article at Ajami dialect may be this]
• Khorramshahri

These are a regional variety of dialects which are much closer to Standard Persian and in general are easily understood by the average Persian-speaker elsewhere in Iran.