Trabzon

Trabzon looks like a midsized Black Sea city, but one commodity makes it behave like a national choke point. Ortahisar, the urban core of Trabzon, has roughly 335,116 residents in 2025 and sits only 39 metres above sea level on a narrow strip between the sea and steep mountains. Yet firms based in Trabzon booked $836.6 million of hazelnut exports in 2024, about 32% of Turkey's entire hazelnut export value. That is far more influence than the skyline suggests.

The official story is old port city, regional capital, and tourism gateway. The Wikipedia gap is that modern Trabzon wins by brokerage, not by size. The eastern Black Sea grows the nuts, but traders, exporters, customs expertise, shipping routines, and buyer relationships have accumulated in Trabzon for so long that the city captures an outsized share of the value flowing through the crop. That concentration keeps reinforcing itself. Once global buyers know where the paperwork clears fastest and where the export houses already sit, they come back to the same node.

The transport numbers show the same mechanism. Trabzon Havalimanı handled 3,535,902 passengers and 37,358 tons of cargo in 2023, and Ankara is now replacing it with a 10 million-passenger airport on reclaimed land because the current site has no room to expand. Hazelnuts and air traffic are different businesses, but they reveal the same urban logic: Trabzon is a habitual gateway for regional flows. Volume attracts logistics capacity, logistics capacity attracts more volume, and the city becomes harder to bypass. This is network effects reinforced by positive feedback loops.

The biological parallel is slime mold. Slime molds do not dominate by size; they dominate by discovering and reinforcing the most efficient paths through a fragmented landscape. Trabzon does the commercial version. Its power comes from sitting where regional supply, transport infrastructure, and buyer habits keep finding the same route again.