Yalova is a market-gardening town located in northwestern Turkey on the eastern coast of the Sea of Marmara. It is the seat of Yalova Province and Yalova District. Its population is 133,109 (2022). A largely modern town, it is best known for the spa resort at nearby Termal, a popular summer retreat for residents of Istanbul.

The Sea of Marmara, also known as the Sea of Marmora or the Marmara Sea, is a small inland sea located entirely within the borders of Turkey. It connects the Black Sea to the Aegean Sea via the Bosporus and Dardanelles straits, separating Turkey’s European and Asian sides. It has an area of 11,350 km2 (4,380 sq mi), and its dimensions are 280 km × 80 km. Its greatest depth is 1,370 m (4,490 ft).