The orbiter that gave us the most detailed maps of Venus's surface to date was:

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Magellan was an orbiter sent by NASA in 1989 specifically to map Venus's surface using radar. It produced high-resolution maps of 98% of the planet's surface, with a resolution up to 100 times better than previous missions. The orbiter that gave us the most detailed maps of Venus's surface to date was Magellan, which orbited Venus from 1990-1994 and used radar to map about 99% of its surface. Pioneer 11 and Venera 14 were both missions to Venus, but did not provide as detailed maps as Magellan. Galileo and Venus Express were missions to Jupiter and Venus, respectively, but did not focus on detailed mapping of Venus's surface.

The Orbiter That Gave Us the Most Detailed Maps of Venus's