The Tannerman Ocean was a large body of water on the planet Sphinx. The water has a bluish-silver color to it. Part of the ocean included the Tannerman Gulf.

In 1904 PD, Honor Harrington took a vacation to a beach on the Tannerman. (HH3) The Harrington Clan's family home was located near it. (HH4) Tanners Port was located near the ocean. (HH12)

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