Which type of boat is characterized by a wide hull and is often used in calm waters?

A catamaran is characterized by its wide hull, which consists of two parallel hulls connected by a deck. This design provides several advantages, particularly in calm waters. The increased stability offered by the dual hulls allows catamarans to sail smoothly and reduces the likelihood of tipping over. This stability, along with a flatter bottom profile, makes catamarans particularly well-suited for cruising in calm conditions, where their design can maximize comfort and efficiency.

In contrast, a yawl has a narrower hull and is typically designed for sailing rather than stability in calm waters. Motorboats vary widely in design, with some being more suited for speed or rough waters rather than stability. Ferries, while they may have stable designs for carrying passengers or vehicles, do not necessarily feature the same wide-hulled configuration characteristic of catamarans. Thus, the distinct design and purpose of a catamaran make it the most accurate choice for the question regarding boats suited for calm waters.