The phrase "eastern shoreline" refers to the area where land meets the eastern side of a body of water, like an ocean, sea, or lake. It describes the edge or boundary of land that is towards the east when looking at the water. Full definition
The entire eastern shoreline of Turneffe is protected by a continuous vertical reef approximately 35 miles (56 km) long. (xcalak.info)
Camping: Ruckle Provincial Park offers the only public camping on Saltspring Island with scenic campsites along the island's North Eastern shoreline. (discovervancouverisland.com)
She came to rest on Fraser Island's wild and exposed eastern shoreline. (aglasshalf-full.com)