Sesefras Magna was a giant gas planet orbiting the star Zondostina in the Pleiades system. The space near the planet was home to the space station Port Sesefron, a docking place for Xaxisian battleships and other spacecraft visiting the star system. Ford Prefect took an Escape-O-Buggy from the sales ship he left in orbit around Epun to Port Sesefron. Zaphod Beeblebrox once bought spray-on pants from Port Sesefron.
Sesefras Magna was home to gas dragons and the Cyphroles, a race of tiny invertebrate gastrozoa.
Sesefras Magna appeared in:
- Chapter 10 of the Douglas Adams novel So Long, and Thanks for All the Fish.
- The Eoin Colfer novel And Another Thing....