Saltwater wetlands are more likely to be inland, while freshwater wetlands are more likely to be close to coast.

This is false. Saltwater wetlands are more likely to be near the coast because they contain salty water just like the ocean which is probably where the salt water originated. Freshwater wetlands are more likely to be inland because they are farther away from the coast and ocean which gives them a less likely chance to be contaminated by salty ocean water.