Are there salt bodies on our planet except seas and oceans?

Yes, there are also salt lakes.
Salt continental water bodies, in particular lakes, are very numerous in Russia. Only within the Astrakhan region there were up to 700 salt lakes. Their origin is quite understandable. Any lake, unless it is flowing, enclosed, that is, has no runoff, should sooner or later become salty due to the evaporation of water, especially if it is located in arid regions and on very saline rocks. The degree of salinity of such water bodies can be very significant, up to the precipitation of salts from a saturated solution. So, for example, in lakes with a predominance of table salt, the salt content reaches 285 g per liter of water, and with a predominance of glauber salt, up to 347 g per liter of water. And yet, even in such conditions, algae live. True, the number of algae species decreases with increasing salinity, and only a few of them tolerate very high salinity, but there are a lot of salt-tolerant forms.
The Great Salt Pond is located at the southeast end of St. Kitts and borders the Atlantic and the Caribbean.
Kulundinskoye Lake is a closed, bitter-salty body of water at an altitude of 98 m above sea level. m. on the Kulundinskaya plain (Altai Territory).
Located in the Nienchen Tangla Mountains in Tibet, Namtso Lake is located at an altitude of 4,627 meters above sea level. It is the highest mountain inland salt-free lake in the world, and the largest salt lake in the Tibet Autonomous Region.