Sonography has been embraced broadly by the medical profession. It is used in what is called medical imaging. The use of sonar by medicine is the widest use of the technology. Yes, it is still used in water (and on a lot of other things) by lots of other folks, but we use it a lot to "see inside" the human body. The imaging of the yet-to-be-born is commonplace. In medical imaging, the frequencies used to probe and resolve images of body tissues are much higher than they are in applications that are more "traditional" like those in marine environments where terrain is mapped or fish are located. These frequencies go well beyond human hearing, and are, therefore called ultrasonic. Use the link to the Wikipedia article on this application of sonar to get more information.
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Sonar scans have grown to play an integral role in the medical field. For instance, gynaecologists make use of ultrasound scans to show would-be parents images of their unborn children.
Scuba Divers use a Sonar to find treasure or a hidden ship.
Many species of sharks do not use sonar, as they have very effective senses, but some species are thought to. The hammerhead shark, in particular, is thought to use sonar waves detection.
Botos use sonar to navigate and hunt. They resemble dolphins.
ultrasound
Reverberations