As the waters of Unawatuna are calm, somewhat shallow, and clear blue, they are ideal for snorkelling. With many marine species occupying the warm waters of Sri Lanka, quite a number of them can be found swimming around the waters of Una. From the countless fish varieties to sea turtles, there is a thriving marine population here. The lively coral reef in some parts of Unawatuna are fragile so do keep in mind not to step on them or touch them, as much of it was destroyed following the 2004 Tsunami that hit the country.