The Mar Menor is a large laguna near Murcia. It is only separated from the Mediterranean by a long narrow strip.
This narrow strip can be reached from the south side of the Mar Menor. There are several tourist places such as La Manga del Mar Menor. The further north you drive, the narrower this strip becomes. At various places you can see the water both to your left and to your right.
The Mar Menor is especially popular because the enclosed water there is often a lot warmer than in the Mediterranean Sea. The area is also popular with water sports enthusiasts. The well-known mud baths of Lo Pagan also border the Mar Menor.