Deep Bight is a deep indentation into Tongue Point, where the late Nineteenth Century a fence went up over the hill separating the land into two areas.
The bay has steep rock and clay hillsides and no flat land. It is marked nautical charts due to the good anchorage provided by deep water.
The entire peninsula separating Opihi Bay and Whangakoko Bay is now known as Separation Point but in the Nineteenth Century it was known as the Tongue.
The point at the end of the peninsula was called the Tongue End and at times, Point Underwood.1
1. James R. Eyles, Place Names of Port Underwood - a post European History, (Picton: October Enterprises, 2002) 33-34.