It is more likely an anglicized form of the Māori words toma haka, often interpreted as "dance by a gravesite".

[4] The lagoon, which is connected by a short stream to the Pacific Ocean, is noted for its bird life.

Despite its name, it is never inundated with the sea, but is more of a shallow coastal lake, predominantly under 1.5 metres (4.9 ft) in depth.

To the west of the lagoon's mouth is the prominent headland of Lawyers Head, a major Dunedin landmark.

[6] Several small streams flow through the steep valleys which lie to the north and northeast.