Sinclair Island, located off the western shore of Skagit County, Washington, is a serene destination known for its natural beauty and outdoor activities. The island offers scenic hiking trails, excellent spots for kayaking and fishing, and opportunities for wildlife viewing. With a land area of approximately 4.109 km², it is home to a few private residents and has a rich history, having been named by Charles Wilkes during the Wilkes Expedition of 1838–1842. The island's remote setting makes it an ideal spot for those seeking tranquility and connection with nature.
Visitors can enjoy the island's peaceful atmosphere and engage in various activities such as exploring the surrounding islands and waterways. However, it is essential to plan ahead as there are no restaurants or hotels directly on the island. Access is primarily by boat or water taxi, adding to the island's secluded charm.
The island's history includes being referred to as Cottonwood Island due to its past use for lumber harvesting. Today, it remains a secluded getaway with limited infrastructure, making it perfect for those who enjoy solitude and the great outdoors.