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. 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 factors to take into account include surf, tides, currents, waves, boat launches, coral reefs, wall dives, and even remote locations. Arctic and Antarctic conditions can be quite spectacular but are outside of the purview of recreational sport diving.