The D400 Highway is a major road in Turkey that runs along the southwestern coast, connecting the cities of Antalya and Marmaris. It is known for its scenic views of the Mediterranean Sea and the surrounding mountains, making it a popular route for both locals and tourists. This highway is part of the larger network of roads in Turkey and plays a crucial role in facilitating transportation and trade in the region. Along the D400, travelers can find various attractions, including beaches, historical sites, and charming towns, enhancing the overall travel experience.