It has narrow coastlines, limestone plateaus, and coastal plains. High waves eroded northern coastlines and damaged lagoons. Colombia has vast coastlines, mountainous areas, and tropical jungles. The Australian mainland has a total coastline length of with an additional of island coastlines. Saltwater swamps are found along tropical and subtropical coastlines. The region has extensive coastlines, valleys and mountain ranges. Mangroves dominate three quarters of tropical coastlines. The peregrine falcon lives mostly along mountain ranges, river valleys, coastlines, and increasingly in cities. Numerous small islands spread from the Central to Southern coastlines. Hammerheads are found worldwide in warmer waters along coastlines and continental shelves. Vast tidal flats have been developing on the south and west coastlines. These numbers exclude the Great Lakes coastlines. They mostly forage near mainland coastlines, the continental shelf, and seamounts. The number of oceanic dead zones near inhabited coastlines are increasing. They also served as the police and watchers on the land, coastlines and seas.