Seattle is located between the saltwater <answer>Puget Sound</answer> (an arm of the Pacific Ocean) to the west and Lake Washington to the east. The city's chief harbor, Elliott Bay, is part of <answer>Puget Sound</answer>, which makes the city an oceanic port. To the west, beyond <answer>Puget Sound</answer>, are the Kitsap Peninsula and Olympic Mountains on the Olympic Peninsula; to the east, beyond Lake Washington and the eastside suburbs, are Lake Sammamish and the Cascade Range. Lake Washington's waters flow to <answer>Puget Sound</answer> through the Lake Washington Ship Canal (consisting of two man-made canals, Lake Union, and the Hiram M. Chittenden Locks at Salmon Bay, ending in Shilshole Bay on <answer>Puget Sound</answer>).
What water mass is located west of Seattle?
Puget Sound