Long before the Ottoman Empire adopted modern postal administration in the mid-19th century, it operated one of the most extensive and disciplined communication networks in Eurasia. This system, built around ulaks (state couriers) and menzils (relay stations), enabled the rapid movement of official mail, military orders, diplomatic correspondence, and administrative reports across three continents.
At its core was a carefully engineered road network radiating from Istanbul, the imperial capital. These roads were organized into three major routes in Anatolia and three in Rumelia, each supported by secondary roads and a chain of menzil stations where couriers could change horses, rest, and continue their journey without delay.
The Structure of the Ottoman Postal Road Network
Three-Armed System
The Ottoman road system was designed in a “three-arm” configuration:
- Right Arm
- Central Arm
- Left Arm
This structure existed both in Anatolia (Asian Turkey) and Rumelia (European Turkey), ensuring that every region of the empire was connected to Istanbul through predictable, well-maintained corridors.
Each arm was lined with menzil stations, spaced roughly 40–70 km apart, a distance that allowed an ulak to ride at full speed, change horses, and continue without losing momentum.
Anatolia (Asian Turkey)
1. Right Route: The Pilgrimage and Syria Road
Üsküdar → Gebze → Eskişehir → Akşehir → Konya → Adana → Antakya → Aleppo → Damascus → Al-Hejaz
This was the most spiritually significant of the Ottoman routes. It carried:
- Official mail to the Syrian provinces
- Military dispatches during campaigns in the Levant
- The annual Hajj caravan, which departed from Istanbul and traveled toward Mecca and Medina
The right route was lined with menzils that were reinforced during pilgrimage seasons, ensuring safe passage for both couriers and caravans.
2. Central Route: The Baghdad–Basra Road
Üsküdar → Gebze → İznik → Bolu → Tosya → Merzifon → Tokat → Sivas → Hasan Çelebi → Malatya → Harput → Diyarbakır → Nusaybin → Kirkuk → Baghdad → Basra
This was the longest and most strategically important road in the empire. It connected Istanbul to:
- Eastern Anatolia
- Northern Mesopotamia
- Baghdad
- The Persian Gulf
Couriers on this route carried:
- Provincial tax registers
- Military orders for frontier garrisons
- Diplomatic correspondence with regional governors
Because of its length, the central route had the highest number of menzils, each stocked with horses, fodder, and supplies.
3. Left Route: The Erzurum–Kars–Tabriz Road
Merzifon → Ladik → Niksar → Şebinkarahisar → Kelkit → Aşkale → Erzurum → Kars → Tabriz
This route served the empire’s eastern frontier and connected the Ottomans to:
- The Caucasus
- Safavid and later Qajar Persia
- Eastern trade caravans
It was heavily used during Ottoman–Persian conflicts and for diplomatic missions between Istanbul and Tabriz.
Rumelia (European Turkey)
1. Right Route: The Crimean Road
Istanbul → Vize → Kırklareli → Prevadi → Karasu → Babadağı → İsakçı → Akkirman → Özü → Crimea
This road linked the capital to the northern Black Sea and Crimean Tatar territories. It carried:
- Military correspondence
- Diplomatic mail to Crimean khans
- Trade-related dispatches along the Black Sea corridor
2. Central Route: The Via Militaris
Istanbul → Silivri → Edirne → Plovdiv → Sofia → Niš → Yagodina → Belgrade
This was the empire’s main Balkan military artery, used for:
- Campaigns in Serbia, Hungary, and Austria
- Administrative communication with Balkan provinces
- Movement of troops and supplies
Its origins dated back to Roman times, and the Ottomans maintained it as a strategic lifeline.
3. Left Route: The Via Egnatia
Istanbul → Tekirdağ → Malkara → Komotini → Kavala → Thessaloniki → Larissa → Tebai → Drac
This ancient Roman road connected Istanbul to the Adriatic. Under the Ottomans, it served:
- Western Balkan provinces
- Trade routes to Venetian and later European ports
- Diplomatic missions to Western Europe
Secondary Roads and Western Anatolia
Beyond the major arms, the empire maintained dense networks of secondary roads. One of the most active regions was Western Anatolia, where postal routes connected commercial centers:
Hendek → Gemlik → Mudanya → Ulubat → Susurluk → Ayazment → Bergama → Manisa → Urla → Çeşme → İzmir
These roads supported:
- Merchant caravans
- Local administrative mail
- Communication between Aegean ports and the capital
Derbends and Menzils: The Infrastructure Behind the Routes
Before the establishment of formal menzil stations, the Ottomans relied on derbends, fortified passes or guard posts that ensured safe travel through mountains, forests, and river crossings.
Over time, derbends were replaced or supplemented by menzils, which offered:
- Fresh horses
- Food and lodging
- Security
- Shelter for couriers, soldiers, and ambassadors
These stations were the backbone of the ulak system. Without them, the empire’s communication network could not have functioned.
A System Built for Speed, Security, and Empire
Before the postal reforms of the 1860s, the Ottoman Empire operated a communication system that was both highly organized and remarkably efficient for its time. The three-arm road structure ensured that every province, from the Balkans to Arabia and from Baghdad to Crimea, was connected to Istanbul through predictable, well-maintained routes.
The menzil stations and the ulak couriers formed a logistical machine that allowed the empire to govern vast territories, respond quickly to crises, and maintain administrative cohesion for centuries.
