A proper introduction needs to define the objects of attention. Yet, the term “lake,” while tangible, cannot be simply defined. If the Oxford’s dictionary qualifies a lake as a large area of water that is surrounded by land, it does not specify the blurred distinction between a shallow lake and a pond using more than a relative criterion for size or depth. Similarly, the distinction between large salty lakes and seas is based upon lakes not being directly connected to any ocean or marine basins. But coastal lakes or lagoons somewhat lie in between. Some confusion therefore arises from this floating definition of lakes so that undue reliance should not be put on their given names: remember that the largest lake in the World is named after a sea (the Caspian Sea). On the other end of the size spectrum, some shallow but relatively large waterbodies named ponds end up being larger than others bearing the name of lakes. Lakes are entangled within a hydrological continuum that defies the scientific practice of categorizing objects and, ultimately, definitions for lakes remain mostly operational.