Fjords are deep, narrow inlets of the sea that are typically surrounded by steep cliffs or mountains. They are formed by the glacial erosion of valleys, which creates a U-shaped profile. As glaciers retreat, seawater fills these valleys, resulting in the unique landscape characteristic of fjords. These natural formations are often found in regions with a history of glaciation, such as Norway, New Zealand, and Chile. Fjords can be quite scenic, attracting tourists and nature enthusiasts who enjoy their dramatic beauty and diverse ecosystems. They also serve as important habitats for various marine life.