Sakarya is one of the most beautiful cities in Turkey and it is worth noting its economic and tourism growth, its capital is the city of Adapazari and has a population of 917,109 people, and this city is located at the intersection of all important roads and railways in that region, located in northern Turkey on the Black Sea coast in the Marmara tourist region It has an area of ​​4,895 km2. The city of Sakarya is characterized by the presence of many tourist attractions dating back to the era of the Romanians, the Byzantines, and the Ottomans. We will refer to the most important of them as follows: Justinianus Bridge was built over the Sakarya River by the Byzantine Emperor Justinianus and it is distinguished by its eight arches and its length is four hundred and twenty nine. Among the historical bridges also known in Sakarya is the Ali Fouad Pasha Bridge, which connects Geyve County with the town of Ali Fouad Pasha, and this bridge was built in the year one thousand four hundred and ninety-five by order of Sultan Bayezid II. Orhan Mosque and Yunus Pasha Mosque, which were built in the fifteenth century, are characterized by Ottoman design, as it highlights the three huge domes. One of the most important tourist attractions in Sakarya is the natural areas in it. It is full of lakes, beaches, hot springs and mineral water springs. Many activities and outdoor and marine sports are held in these areas such as walking, sailing and surfing in addition to that Sakarya is characterized by curative tourism. Especially in the spring to treat arthritis and various skin diseases using mineral water, hot springs and mud.