While it's technically a fjord, a type of inlet, it's formed by a glacial valley, making it a massive U-shaped valley carved by the movement of glaciers. Here are some of its key features:

* Length: 205 kilometers (127 miles)

* Depth: 1,308 meters (4,291 feet) at its deepest point

* Width: Varying, with narrow sections and wide sections

* Location: Western Norway, within the Sogn og Fjordane county

It's important to note that while Sognefjord is the longest and deepest fjord in Norway, some argue that the Lyngenfjord in northern Norway is actually the largest U-shaped valley in Europe based on its volume. However, the Sognefjord is generally considered the largest due to its impressive length and depth.