Do You Call Going To The Lake ‘The Beach’?

I always laugh when I hear people say they went to the beach.  I'll ask which one they went to?  Popham?  Reid?  OOB?  They respond with Lake St. George or Damariscotta Lake.  To me, that's not the beach.  The beach is the ocean.  But, according to dictionary.com:

Beach: the part of the shore of an ocean, sea, large river, lake, etc., washed by the tide or waves.

So, the beach can be considered any of the above...not just the ocean.  But, I strongly disagree.  If you're going to the lake, you say 'I'm going to the lake'.  If you're going to Popham, OOB or another...you say 'I'm going to the beach'.

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