Bainbridge Island is located at (47.655260, -122.535083). Bainbridge Island was formed during the last ice age — 13,000 to 15,000 years ago — when the 3000-foot thick Vashon Glacier scraped out the Puget Sound and Hood Canal basins. Bainbridge Island is located within the Central Puget Sound Basin, east of the Kitsap Peninsula and west of the City of Seattle, WashingtonSeattle. The Island is approximately five miles (8 km) wide and ten miles (16 km) long, encompassing nearly 17,778 acres, or 28 square miles (73 km sq), and is one of the larger islands in Puget Sound. Bainbridge Island shorelines border the main body of Puget Sound, a large protected embayment, Port Orchard Bay, and two high-current passages, Rich Passage and Agate Passage. The island is characterized by an irregular coastline of approximately 53 miles (85 km), with numerous bays and inlets and a significant diversity of other coastal land forms, including spits, bluffs, dunes, lagoons, cuspate forelands, tombolos, tide flats, stream and tidal deltas, islands, and rocky outcrops. On the Kitsap Peninsula, Bremerton, WashingtonBremerton and Poulsbo, WashingtonPoulsbo lie across the Port Orchard channel to the west, and the city of Port Orchard, WashingtonPort Orchard lies across Rich Passage to the south. The island is quite hilly, and is known for its popular Chilly Hilly bicycle ride held every year in February. This ride has been the unofficial start to the bicycling season in the Pacific Northwest since 1992. Bainbridge Island is connected to the Kitsap Peninsula by a bridge carrying Washington State Route 305WA-305 over Agate Passage, and to Colman Dock in Seattle, WashingtonDowntown Seattle by Washington State Ferries service from Winslow in Eagle Harbor. According to the United States Census Bureau, the city of Bainbridge Island has a total area of 169.7 km sq (65.5 square miles). 71.5 km sq (27.6 mi sq) of it is land and 98.2 km sq (37.9 mi sq) of it (57.87%) is water. Source: http://en.wikipedia.org/wiki/Bainbridge_Island%2C_Washington