This volume - Waves in Geophysical Fluids - contains extended versions of the lec- tures that were given at a summerschool in Centre International des Sciences Mecaniques (CISM), Udine, Italy, during the week of 11-15 July 2005. The subjects of the school covered: the formation of the very long tsunamis, the much shorter rogue waves taking place on the sea surface, very large oceanic internal waves and, finally, internal tides and hot spots in the ocean. The subjects were chosen because of their implications to the safety of human activity in and in relation to the ocean environment, and the...