Nevada's mighty Humboldt River and its pathological meanders.
My first mapping project in Nevada (back in 1998!) was the Battle Mountain Quadrangle, which is completely dominated by the broad floodplain of the Humboldt River. The floodplain is inherited from an ancient lake bed and is extremely flat. Thus, the river meanders like crazy (despite the young age of its course!). The floodplain exhibits textbook fluvial forms and alluvial stratigraphic assemblages (including Pleistocene mega-meanders!). It is also bounded by numerous active faults which enhance its behavior in various ways. While we were working on this and a couple of other quads, the Washington Post published an article in which they named the town of Battle Mountain the 'Armpit of America'. Thus, we had to accept the fact that we were mapping meanderbelts that were essentially the curly hairs in the armpit.
Notably, It was on the broad, flat, and often monotonous floodplain of the Humboldt River that I truly learned the value of GPS in geologic mapping.
Oh, Battle Mountain, how I will miss you.