Diving in fresh and salt water can be quite different in regards to general conditions and aquatic and plant life.
Examples of fresh water are lakes, quarries, springs, dams, rivers, and ponds. There may be interesting activities such as wreck diving, cavern diving, strong-current diving, and mountain-altitude diving. (For some of these activities, you will need additional training.) Don’t forget that when you dive in fresh water, you will be heavier because fresh water weighs less than salt water. So, take some weight off!
Recreational diving in salt water usually takes place in tropical and temperate zones and can include surf, tides, currents, waves, boat launches, coral reefs, wall dives, and some remote locations. Arctic and Antarctic conditions need special training but can be quite spectacular.