Sakarya is a province located in the Marmara region of Turkey. Its capital city is Adapazarı. The province is bordered by the Black Sea to the north, Kocaeli to the west, Bursa to the south, and Düzce to the east.Sakarya has a rich history and was an important center of the Ottoman Empire. The province is home to a number of historical sites, including the Akova Mound, the historical castle of Taraklı, the Söğütlü Mosque, and the Akyazı Caravanserai.The economy of Sakarya is largely based on industry and agriculture. The province is home to a number of industrial zones, including the Adapazarı Industrial Zone, which is one of the largest in Turkey. The agriculture sector in Sakarya produces a variety of crops, including fruits, vegetables, and grains.Sakarya is also known for its natural beauty, including its forests, lakes, and rivers. The Sapanca Lake, located in the province, is a popular tourist destination for its scenic beauty and recreational activities. Additionally, the province is home to the Karasu Beach, which is one of the most popular beaches in the Marmara region.