Sound waves travelling quite far:

http://www.du.edu/~jcalvert/waves/barisal.htm

though this is not ducting over the water. I think the record for that is 10
miles somewhere in Australia.

Cities in the sky:

http://www.unmuseum.org/mirage.htm

http://www.geocities.com/TheTropics/...002/mirage.htm

http://dimdima.com/Science/Quiz/show...20of%20Mirages

Microwave ducting:

http://www.theweatherprediction.com/habyhints/234/

http://ams.allenpress.com/perlserv/?...D%3E2.0.CO%3B2

Even more shocking!

The ocean is not smooth or round:

See figure 5:

http://images.google.com/imgres?imgu...off%2 6sa%3DN