溺谷经潮流和波浪的强烈冲刷，扩展成喇叭口而形成的海岸。一般分布在河流的河口处陆地下沉或海面上升，而且潮汐作用比较强大的地区。
梅多克是延伸在吉伦河左岸的产区，这个三角湾有80公里长，2到5公里宽；
The Médoc peninsula extends along the left bank of the Gironde Estuary. it is 80km long and its width varies between 2 and 5km.
比较大的构造是索尔顿海槽，它是从加利福尼亚湾延伸出的一片洼地，穿过现代的科罗拉多河三角洲，向西北进入加利福尼亚，直达索尔顿海。
The larger structure is the Salton Trough, a depression that stretches from the Gulf of California, through the modern Colorado River Delta, and northwestward into California as far as the Salton Sea.
作为通往密西西比河三角洲南方和西南顶端方向的航道，(图像中左及左下角)的明亮的水道为船只提供了进入墨西哥湾的通道。
The bright waterways known as the South and Southwest Passes of the tip of the Mississippi River Delta (image center left and lower left) provide passage for ships into the Gulf of Mexico.
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