登录
a large area of land or of the world with specific characteristics, which is usually borderless
地区
a hole or chamber formed underground naturally by rocks gradually breaking down over time
洞穴
an area of rock that is high above the ground with a very steep side, often at the edge of the sea
悬崖
having a surface that is covered with large, uneven, or rough rocks, stones, or boulders
多岩的
a valley that is deep and has very steep sides, through which a river is flowing usually
峡谷
the boundary between land and water, particularly as seen on a map or from above
海岸线
a pale brown substance that consists of very small pieces of rock, which is found in deserts, on beaches, etc.
沙子
a long and artificial passage built and filled with water for ships to travel along or used to transfer water to other places
运河
a wide stretch of water that connects two larger areas of water, particularly two seas
水道
the average height of the surface of the ocean in relation to the land, measured over a specific period of time
海平面
an area under the protection of a government, where people can visit, for its wildlife, beauty, or historical sights
国家公园
a mountain with an opening on its top, from which melted rock and ash can be pushed out into the air
火山
