At Sinks Canyon State Park, the Popo Agie (pronounced pa-po-sha, meaning "Tall Grass River" to the Crow Indians) flows into a limestone cavern. The crashing water "sinks" into fissures only to resurface ½ mi downstream in the "rise," where it reemerges and huge fish (mainly rainbow and brown trout) swim in the calm pool. Wildflowers, Rocky Mountain bighorn sheep, black bears, golden eagles, moose, mule deer, marmots, and other wildlife wander the grounds. The park is ideal for hiking, camping, and picnicking. No fishing is allowed, but visitors can toss fish food to the trout from the observation deck.