The North East side of the harbor is located in the village of Hyannis.

Hyannis Harbor extends on shore from the southerly point where the breakwall makes landfall to the small jetty at Dunbar Point on Kalmus Beach.

The harbor was used by packet schooners, often as a layover awaiting favorable winds to sail the treacherous back side of the cape to or from Boston.

The harbor is now mainly used by private vessels and is home to the Hyannis Port Yacht Club.

[2] NOAA Nautical chart 13229 shows the relation between Lewis Bay and Hyannis Harbor.