Pu'upehe Platform, Archaeological site and sea stack in Lanai island, Hawaii.

Puʻupehe is a triangular sea stack rising 150 feet from the water off the peninsula between Mānele Bay and Hulopoʻe Bay on Lānaʻi. Its summit holds a carefully arranged stone platform that archaeologist Kenneth Emory examined in 1921 and found to contain only sea bird bones, not human remains.

Archaeological examinations conducted in 1921 by Kenneth Emory discovered bird bones at the site, suggesting its use as a possible shrine for hunters or fishermen. These findings indicate the place served ritual or practical purposes for early inhabitants.

The Hawaiian name Puʻupehe and the English nickname Sweetheart Rock both refer to Pehe, a chief's daughter whose jealous husband Makakehau, called 'Misty Eyes', kept her in a cave facing the open ocean. While he fetched fresh water a storm flooded the cave and she drowned; he carried her body to the top of the stack and jumped to his death. The story is still told to visitors.

The rock lies close to shore and is best viewed from Hulopoe Beach or during a boat trip, which allows visitors to observe the formation from different angles. The surrounding waters have varying conditions, so it helps to check local conditions before planning water or beach activities.

In 1921 archaeologist Kenneth Emory examined the stone arrangement on the summit and found no human remains, only sea bird bones. He concluded the carefully laid stones were an altar built by bird hunters or fishermen, not the tomb of the legend.