Boryeong, commonly known as Daecheon, is a city in South Chungcheong Province, South Korea. It is located on the coast of the Yellow Sea. It lies on the Janghang Line railroad, which connects it to Seoul via the Gyeongbu Line. It is also connected to the Seohaean Expressway. Boryeong is known around Korea for its beaches, particularly Daecheon Beach, and its annual mud festival around July, Boryeong Mud Festival. The city's beach-mud is widely touted for its cosmetic properties. As elsewhere along the southwest coast of the Korean peninsula, there are numerous small islands, many of which are connected by ferry to Daecheon Port.

South Chungcheong Province, also known as Chungnam, is a province of South Korea in the Hoseo region in the southwest of the Korean Peninsula. South Chungcheong borders the provinces of Gyeonggi to the north, North Chungcheong, Sejong Special Self-governing City, and Daejeon Metropolitan City to the east, and North Jeolla to the south.