Definition: The topographical boundary dividing two adjacent catchment basins, such as a ridge or a crest.

Alright class, settle down now, let’s take a look and see, At the word "watershed," it’s important for you to decree! The dictionary gives us a clue, precise and neat, "Topographical boundary," a landscape we must meet. Think of it like this, my dears, a hill or mountain high, A ridge you might call it, reaching toward the sky! It’s where rivers change their course, a pivotal bend, Dividing streams that flow, until the very end. Like catching raindrops, one basin then another, The watershed's the line – a crucial border! So a catchment basin is the land that gathers rain, And this ridge or crest determines where it will remain. It’s a dividing point, a significant place, A watershed , remember with effortless grace! Do you have any questions? Let's discuss and explore, Understanding watersheds – wanting to learn more!