Alluvial Fan. A fan-shaped deposit of alluvium on a hillside below the mouth of a mountain canyon where the alluvium spreads out across the hillside and down to the valley floor. Alluvial fans form the hillside below the steep sides of a mountain and above the valley bottom.

Bajada. A series of alluvial fans (one per canyon) that have coalesced into one larger landform along the side of a mountain or mountain range.

Canyon. A narrow chasm with steep sides cut by running water; a gorge or ravine.

Mountain. A large, high land mass that projects above the surrounding area.

Peak. The highest point on a mountain.

Playa. A normally dry lake bed, usually white in color from the clay materials that form the surface; often surrounded by salty soils.

Ridge. A long narrow upper section or crest; a long narrow chain of hills or mountains. An area of high ground separating two canyon formed by erosion on both sides. Ridges range in size from those between small gullies to the crest of an entire mountain range. Also called ridgeline.

Wash. Landform. An intermittent streambed where water may flow after a rain.