What type of sound is particularly effective for many marine mammals because it allows sound to travel for very long distances in water? ?

They produce narrow-band high-frequency sound to help them navigate in water. These high-frequency sounds are used in echolocation.  Echolocation is used to identify and locate prey and also avoid the predators. Marine mammals like whales and dolphin use echolocation in different manners.

Called for cell.

Abay where the river empties into the sea