Forest Park (Portland, Oregon)

Forest Park west of downtown Portland, Oregon is the largest natural forest reserve within a city in the U.S., with over 5000 acres (20 km²) of old growth forest, threaded by miles of recreational trails. Forest Park stretches for over eight miles (13 km), overlooking the Willamette River.

It is commonly said to be the largest city park in the United States; however, South Mountain Park in Phoenix, Arizona, which is about 16,000 acres (65 km²) in size, has that honor.

By the 1980s, 112 species of birds had been recorded in the park.