Caroline Bay is a prominent coastal feature of Timaru, a port city on the South Island's Canterbury coast. The bay itself is a broad, sandy beach stretching approximately 3 kilometers, forming a natural harbor protected by the Port of Timaru's breakwater structures. The seabed is predominantly sandy, though the area around the breakwater and outer harbor features rocky structures. The bay is a multi-use area, popular for swimming, walking, and penguin viewing, with the water quality monitored weekly during the summer months. As a saltwater fishery, it offers accessible, year-round shore fishing with no license required, drawing anglers for both sport and sustenance.