Coming off Buffalo Stampede, is the Yumpa River. Cutting through a vast valley of rolling hills, and steep canyons, it winds for miles flowing east, dumping into a much deeper river. Yumpa river, is relatively shallow, being no more than belly deep, on a tall horse, and varies in width in some areas, being twenty feet wide, to fifty yards wide. There are sandbars all over the river with bits of grassy vegetation. Otter, muskrat, eagles, Heron, Elk, deer, Buffalo, and many other animals make their home here, and come to drink on the water, and graze in the surrounding valley. Very little shelter exists out here, a few tall cottonwood trees here and there. Keep your wits about you here. Cowboys and settlers frequent the area, traveling the river to go from town to town. Indians come to the river to gather water, and to also fish.

This huge over grown sandbar for an island is out in the Yumpa river, and gets its name for the all the plum bushes that grow out on it. A smorgasbord for any bear that makes the trip to the island. Many small vermin like raccoons and opossums swim the river waters to eat on these plums when they are ripe in the late summer/ early fall. They attract many equines also, to taste the sweet juicy plums. But they aren't the only ones to come to the island. Indians will swim over to the island to collect them for winter food stores for their tribes. Be careful.