St Helens, Mount
- an active volcano in SW Washington, in the Cascade Range, rising to 2,560 m (8,312 ft). A dramatic eruption in May 1980 reduced its height by several hundred metres and spread volcanic ash and debris over a large area.圣海伦斯火山（美国华盛顿州西南部喀斯喀特山脉一活火山, 高2,560米, 即8,312英尺; 1980年5月一次剧烈喷发使其高度降低了数百米并且散布了大面积火山灰和岩屑）。