Kocaeli is located in the Marmara region, and is mostly famous for its center, Izmit. In it, many ruins of the Roman and Byzantine eras can be seen, including the Castle, the Temple of Augustus, and the Agora. Most of them are in ruins and difficult to see, but the results of some excavations can be found in the Archaeological Museum. These are considered... The region is a major industrial center in Turkey with many industrial enterprises surrounding the Gulf of Izmit. Due to its size and the natural conditions of the Gulf of Izmit, the state constitutes a huge natural port that faces environmental challenges. Kocaeli plays an important role in linking the continents of Asia and Europe, and its strategic location has enriched its culture and heritage and given it a stunning and unique natural beauty.