一線天位在東引島東側天王澳的左側岬角，為一處聳峭的海蝕溝地形，兩岩壁垂直相鄰至相接，上窄下寬，上接天、下通海，每當潮水灌入，底部海浪拍擊石塊，如萬馬奔騰之音，壯闊迴繞於岩壁間；在兩座山崖之中築有坑道，並建有一座水泥橋相連，橋面距海面僅數十公尺，卻有百公尺以上之氣勢。 岩壁上題有「天縫聆濤」四個大字，絕妙說出這個景點的動人之處，是1972年時任參謀總長的賴名湯將軍蒞臨東引巡視時所題，靜塑於高聳岩壁上，頗有遠戍前線的孤絕之感。 過去，一線天是軍事管制區，但現今一線天已完全開放，不需預約登記就可以自由進入參觀；拾階步行向下，抵達戰備壕溝的終點，「一線天」景致於眼前展現，想聽浪濤聲，隨時都可以前往。
Yixiantian Cliff is a steep sea groove, consisting of two rock walls standing closely to one another. Their upper part is narrower than the lower part, and when tides rush in, hitting the bottom, sounds of the waves resonate on and on between the rock walls. There is a tunnel in between, with a connecting cement bridge. The bridge is just a few dozen meters above the surface of the sea. But it feels as pompous as if it’s a hundred meter tall. In the past, Yixiantian Cliff was controlled by the army. Today, it is fully accessible to the public. You don’t need to make reservations to visit it. Just walk in and explore it freely.
每日開放，夜晚燈光較暗請注意安全
Open daily(all lights go off when the site is closed. Thus, please abide by visitor rules and stay safe)
Yixiantian Cliff
12
00:00-24:00
0836-77267
連江縣東引鄉一線天
Yixiantian Cliff, Lehua Village, Dongyin Township, Lianjiang Township