🇮🇩 Martapura, Indonesia

Martapura is a city located in South Kalimantan, Indonesia. It has a population of around 160,000 people. This city is known for its diamond mining industry and is often referred to as the "City of Diamonds." Martapura is also situated near the Martapura River, which serves as a transportation route for goods and passengers, making it of interest to seafarers and shipowners. However, it doesn't have any ports, shipyards, or factories producing ship parts.