- A hump of bedrock sculpted by glaciers resembles a whale’s back as it rises above the rolling surface of Puget Sound. Rather than an orca, this smoothed geologic feature is Green Mountain, and, true to its form, is what geologists call a ‘whaleback’. Green Mountain is surrounded by a sea of glacial sediment and stands over 1,600 feet above Bremerton, though it once shouldered the weight of over half a mile of ice. In the center of the Puget Lowland, Green Mountain State Forest provides high views of the Olympic Mountains, downtown Seattle, and Mount Rainier. You can hike to the top of Green Mountain on a 4.8-mile round trip, drive to the top, or drive partway and hike the rest for an afternoon summit picnic.