Clouds over the Sea of Japan and the Korean Strait frame the Korean Peninsula, left. At the bottom right, part of the Japanese island Kyushu is also visible.
The southern and western parts of the peninsula have well-developed plains, while the eastern and northern parts are mountainous.
Because the mountainous region is mostly on the eastern part of the peninsula, the main rivers tend to flow westwards.
The southern and southwestern coastlines of Korea form a well-developed ria (drowned river valley) coastline that provides mild seas.
In addition to the complex coastline, the western coast of the Korean Peninsula has an extremely high tidal amplitude (as high as 9 m in some places). Vast tidal flats have been developing on the south and west coastlines.