These are locations where the refraction effects of the ocean cause the sound rays to concentrate.
(These; are; locations where the refraction effects of the ocean cause the sound rays to concentrate) (the refraction effects of the ocean; cause; the sound rays to concentrate; L:locations) Context(the refraction effects of the ocean cause,List([26, 67))):(the sound rays; to concentrate; )
the refraction effects of the ocean cause,List([26, 67))
These the refraction effects of the ocean the sound rays
are cause to concentrate
locations where the refraction effects of the ocean cause the sound rays to concentrate
the sound rays to concentrate L:locations