- Cepu City is a city in Central Java, Indonesia. It is located in the Blora Regency and is known for its oil production. The city is situated between the cities of Semarang and Surabaya. Cepu City has a population of approximately 120,000 people and is a hub for the oil and gas industry in the region. It also has a number of cultural and historical attractions, including the Cepu Forest which is known for its biodiversity. The city is also close to Mount Lawu, a popular destination for hiking and mountain climbing.