The settlement developed in the headwaters area of Mokroluški Potok, a right tributary to the Sava river, which flows between slopes of these two hills.

Gladwin County is a headwaters area.

In the headwaters area, coarse grained decomposed granite overlies heavily fractured granitic based bedrock aquifers.

The headwaters area of Yulupa Creek in Annadel State Park is cited as one of the best examples of California oak woodlands.

DNR staff believe runoff from barnyards and feedlots, particularly in some headwaters areas, to be a severe problem in this watershed.

Slopes within the headwaters area commonly range from 15 to 30 percent, and lower reaches have gradients of two to five percent.

Of note is that the downstream reach of the river "may be uplifting as much as ten times faster than the headwaters area".

The headwaters area of the creek is the only known location of gem quality benitoite, the designated California State Gem.

This middle reach of the creek has more of a suburban character compared to the wild headwaters area.

The longest paths begin in the upper Vorderrhein valley and the upper Landwasser valley, respectively the most western and the most eastern parts of the headwaters area.