With an increasing emphasis on power projection, the Islamic Republic of Iran Navy (IRIN) is responsible for Iran's maritime security in the Caspian Sea, Gulf of Oman, and the greater Indian Ocean. The IRIN is organized into four or five naval regions, details about some of which are unclear. These administrative and/or operational divisions are believed to be largely equivalent to other services' 'regional headquarters'.
1st Naval Region – Bandar Abbas:
The 1st region, as well as the IRIN's general HQ, is co-located with the IRGCN in Bandar Abbas. As of 11/2013, it is commanded by Vice-Admiral (hereafter, BG2*) Hossein Azad. 
* This article employs generic nomenclature for titles (e.g. Brig. Gen. / Mag. Gen.) rather than their naval-specific equivalents (e.g. Rear Admiral / Admiral) in order to simplify the issue as much as possible, and make it clear which positions are equivalent to one another.
2nd Naval Region – Bandar Bushehr or Bandar Jask:
Multiple sources refer to both sites as the IRIN's 2nd region. Facilities at Bushehr pre-date those at Jask and include much of the service's industrial capacity, while the facilities at Jask are more recent, less extensive and reflect the more recent operational shift towards the Indian Ocean.
As 10/2014, the Bushehr regon is commanded by BG2 Mohammed Reza Abbasian.  
As of 10/2013, the Jask region – also known as the 'Velayat' region – is commanded by BG2 Gholamreza Shirani.  
3rd Naval Region – Bandar Konarak:
As of 12/2013, the region is commanded by BG2 Shafii. 
The location of this site is sometimes referred to as Chahbahar, a larger city nearby.
4th Naval Region – Bandar Anzali:
As of 04/2014, the region is commanded by BG2 Afshin Rezai-Haddad. 
In addition to these regions, the IRIN began operating out of an an independent base in Pasabandar in October 2014, which is located at Iran's south-easternmost corner.
Other independent bases are rumored to exist along the Gulf of Oman, but these cannot be confirmed at this time.
Training Centers: 
Imam Khomenei Naval Science and Technology College (Nowshahr)
Marine Training Center (Manjil)
Specialty Training Center (Rasht)
Task Training Center (Sirjan)
Appendix – Commander IMINT:
Known staff-level personnel include:
- Commander: BG Habibollah Sayyari
- Deputy Commander: BG2 Gholam-Reza Khadem Bigham 
- Deputy, Coordination: BG2 Jafari-Tehrani 
- Deputy, Operations: BG2 Siyavash Jareh 
- Deputy, Manpower: BG2 Mohammed Pourkalaher 
- Deputy, Engineering and Passive Defense: Hassan Jafari 
- Head of the Ideology/Politics Office: Mohammed Baqer Rooshandel 
- Head of Research and SS Jihad Organization: BG2 Ali Gholamzadeh 
 News Meeting with the Commander of the IRIN's 1st Region. ISNA. 11/27/2013.
 Overhauled Lavan Warship, Combat Chopper Back into Operation. FNA English. 11/30/2013.
 "The War of the Bushehr Commandos in Khorramshahr" to be Released Soon. IQNA. 10/19/2014
 Commander of the 2nd Velayat Naval Region (Jask): The Sacred Defense Was the Fulfillment of God's Promise. IRNA. 09/27/2013.
 Each Year the IRIN Provides Assistance to Low Income People in this Area. IRNA. 04/28/2013
 Visit of the Commander of the IRIN's 3rd region with the Friday-Prayers Leader of Konarak During Navy Week. Konarak News. 12/02/2013.
 Commander: Iranian Navy's Best Destroyers Navigating in Caspian Sea. FNA English. 04/19/2014.
 NEDAJA Forces Deployed in Pasabandar. Mashregh News. 10/15/2014.
 NEDAJA front page & index.
 Societal Immunity to Cultural Invasion Are Among the Blessings of the Quran. NEDAJA.
 Iran [to] Host Conference on Naval Security in the Indian Ocean (IONS) in 2018. NEDAJA.
 Iranian Navy Warships Repel Pirate Attack on LPG Vessel. FNA English. 10/20/2013.
 Interview with BG2 Mohamed Pourkalaher, the IRIN's Manpower Deputy. Bazarekar.
 Launch of the Jask Airport by the IRIN. NEDAJA.
 New Head of the IRIN's Political-Ideology Office Appointed. FNA. 02/08/2014.
 News Meeting Held with Officials from the Army's Research and Self-Sufficiency Jihad. AJA. 09/23/2014.