I have MANY apps such as this, and this is in my go to top five... seriously, I have around thirty+. I have ALWAYS loved to have environmental sounds going on about me, such as the sounds of thunder storms, birds, trains, and ESPECIALLY WATER.
This thing has such a NICE variety of selections, and as having at one time in my life made my own recordings of different "wave" sounds, I can say that these are pretty much spot-on representations.
I am telling folks about this app... even got it for three others who have issues falling to sleep.
micheljgaudet about RelaxBook Ocean - Sleep sounds for you to relax with waves, ocean, birds and more