The video tutorial explores the concept of landforms, focusing on the main ridge, primary ridges, and valleys. It discusses the key line design system developed by PA Yeomans and modernized by Darren Doherty. The tutorial explains how these landforms function as hydrological divides, creating self-contained watersheds that can be used as land management units. The fractal nature of these landforms is highlighted, showing how their definitions change with scale. The importance of mapping watersheds for effective land management is emphasized, setting the stage for future design layers in the course.

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