Gölcük is a picturesque district located in the Kocaeli Province of Turkey. It is known for its beautiful lake, Gölcük Lake, which is surrounded by lush forests and offers various recreational activities such as hiking and picnicking. The area is also famous for its charming parks and scenic views, making it a popular destination for both locals and tourists. The district has a rich history, with influences from various civilizations over the centuries. Gölcük is also home to several cultural sites, including historical buildings and monuments that reflect its diverse heritage. The local economy is supported by tourism, as well as industries such as shipbuilding and manufacturing.