- A long, narrow canyon formed by the Arkansas River in south-central Colorado. Its near-vertical walls are more than 305 m (1,000 ft) high. The gorge was discovered by Zebulon Pike's expedition in 1806.罗亚尔峡谷：美国科罗拉多中南部阿肯色河形成的狭长峡谷。几乎垂直岸壁有305米（合1,000英尺）多高。这个峡谷是1806年泽布伦·派克在探险时发现的