It's a bit of a trick question! Washington has several major geographical features, so it depends on what you're looking for.

Here are some possibilities:

* The Cascade Range: A mountain range running through the western part of the state, including iconic peaks like Mount Rainier and Mount Baker.

* The Puget Sound: A large body of water, a series of inlets, and islands that make up a significant part of western Washington.

* The Columbia River: A major river that flows through the state and forms a border with Oregon.

* The Olympic Mountains: A mountain range on the Olympic Peninsula, known for its old-growth forests and diverse ecosystems.

So, what are you most interested in? 😊