The broad and well-marked Eggemoggin Reach route is northernmost of the sheltered inside passages that join Penobscot Bay to Jericho Bay. It runs southeast between the mainland and the Deer Isles.

The passage offers dozens of enticing islets and coves, some with yacht facilities and boatbuilding establishments.

It is called a reach because the prevailing southwesterlies usually blow across the length of the channel allowing wind-driven vessels to sail on a reach, whether eastbound or westbound.