Looking on the internet deeply has found these results:

swim at the seaside is the most popular phrase on the web.

swim by the seaside 10 results on the web	swim at the seaside 1190 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	(2011). 4min \| Documentary, Short, Comedy \| 23 April 2012 (USA) � �Quiero ir a la playa! Poster. Ramses loves to swim at the seaside but the law doesn't allow it. Aug 1, 2010 ... ... try again later. Uploaded on Aug 1, 2010. Having scared off the holidaymakers (so he says), The Hard goes for a hard swim at the seaside. Anyone who has tried to swim at the seaside will know that seawater is salty, and not pleasant to drink! We need to drink water that is fresh (i.e. without salt) to�... Sep 17, 2012 ... Go for a swim at the seaside to remind yourself just how much fun it can be. Find a nearby pond, lake or calm and shallow river and go for a�...

swim by the seaside

10 results on the web

swim at the seaside

1190 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

(2011). 4min | Documentary, Short, Comedy | 23 April 2012 (USA) � �Quiero ir a la playa! Poster. Ramses loves to swim at the seaside but the law doesn't allow it.
Aug 1, 2010 ... ... try again later. Uploaded on Aug 1, 2010. Having scared off the holidaymakers (so he says), The Hard goes for a hard swim at the seaside.
Anyone who has tried to swim at the seaside will know that seawater is salty, and not pleasant to drink! We need to drink water that is fresh (i.e. without salt) to�...
Sep 17, 2012 ... Go for a swim at the seaside to remind yourself just how much fun it can be. Find a nearby pond, lake or calm and shallow river and go for a�...