<font face="Verdana, Arial, Helvetica" size="2">Radar will not detect bodies of water on the ground (lakes, rivers etc) as the beam is reflected from the flat surface away from the aircraft. Terrain is detected as is scatters the beam, and the back scatter can be seen on the display</font>
The first "radar guided" bombing raid of WWII using H2S was chosen for Hamburg precisely because of this fact. The Coastline was about all they could discern and apparently ('cos I haven't been there) the coast near Hamburg has a shape that is easy to spot.
Enuf trivia - need to get a life
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