We were on the fourth floor, where you can see the sea shore and also the mountains behind.

shore 是名词，指"海岸、岸边"，特指海洋或大湖与陆地相接的边缘地带。这个词强调从水面到陆地的过渡区域，常用来描述可以步行或休闲的海滩区域。