Barge-mounted rigs are floating platforms used for offshore drilling in bodies of water like oceans and lakes. These rigs are built on barges, which are flat-bottomed boats designed to carry heavy loads. They are equipped with drilling equipment and can be moved to different locations as needed, making them versatile for oil and gas exploration. These rigs are particularly useful in shallow waters where traditional fixed platforms may not be feasible. They can operate in various weather conditions and are often used in conjunction with other offshore structures, such as subsea wells and floating production systems.