Answer:
The region of Washington that has the diversity of the beaches of the Pacific Ocean, the Straits of Juan de Fuca, valleys, mountains and rain forest is the Olympic Peninsula Region.
Explanation:
The Olympic Peninsula is a peninsula that occupies the west and northwest of Washington State, located northwest of the state capital of Olympia and west of Seattle.
The peninsula is connected to the continent from the south. In the east, the shores of the Olympic Sea are washed by the waters of Puget Sound Bay, and from the west by the Pacific Ocean. To the north is the Juan de Fuca Strait, which separates the peninsula from Vancouver Island. The coastline of Olympique is severely indented.
In the central part of the peninsula is located the Olympic National Park, where temperate rain forests grow.
The peninsula is mountainous, especially in the central part. The highest point of the peninsula is Mount Olympus, whose height above sea level reaches 2427 m. There are also many small lakes and mountain rivers on the peninsula.