Mangrove forests are found in coastal swamps, which is option 3. Mangroves are specially adapted plants that thrive in saltwater environments, such as estuaries and coastal areas. They are commonly found in tropical and subtropical regions, where the climate is warm and humid. Mangroves are often found along coastlines with calm waters and high levels of sedimentation. These forests are important ecosystems as they provide numerous benefits, including protecting coastlines from erosion, acting as nurseries for fish and other marine species, and serving as carbon sinks. They are also home to a diverse range of wildlife and provide livelihoods for many communities. It is important to conserve and protect mangrove forests as they are vital for the overall health of coastal ecosystems.