Here's why:

* Piedmont means "foot of the mountain."

* These glaciers form when a valley glacier spills out onto a flat plain at the base of a mountain range.

* The lack of confinement from valley walls allows the ice to spread out in all directions, forming a lobe-shaped mass.

Examples of piedmont glaciers:

* Malaspina Glacier in Alaska, the largest piedmont glacier in the world

* Vatnajökull Glacier in Iceland, which has a large piedmont lobe at its southern edge

* Many glaciers in the Himalayas

Let me know if you have any other questions about glaciers!