Remotely sensed depth prediction in Omura Bay, Nagasaki pleft-lettecture, Japan wasperformed using digital data of band 2 of Landsat-5 Thematic Mapper by an indirectmethods (a use of transparency).Models were developed considering the transparencyhave a good relationship with Landsat-5/TM band 2, and the transpatency have agood relationship with water depth too.Transparency model was developed usingnonlinear regression analysis in other to increase accuracy in this paper.Ther.m.s.error using developed method was measured 2.20m a good value to predictedwater depth of Okinawa sea water.The relationship between depth and transparencywas explained.