Many surface details are visible in this image of Jupiter's largest moon, Ganymede.
To the right is the same image shown with labels of the features I have been able to identify.
In the upper right is Osiris, a relatively recent impact crater surrounded by a large area of bright ejected material.
Next to Osiris is the dark Marius Regio just coming into view, and further south is the bright Uruk Sulcur stretching across the disc. This is a large system of rilles and canyons, separating Marius Regio from the larger Galileo Regio in the south.
Near the south pole is a lighter area identified as Zu Fossae, and to the left is yet another dark area, Perinne Regio, on the left limb.

OPTICS 10" Newtonian f/5.2, TeleVue 5x Powermate
MOUNT Losmandy G11 equatorial
CAMERA Philips ToUCam Pro SC1 webcam
FILTERS None
EXPOSURE ~1000 x 1/25th s
DATE/TIME 18/04/2006 12:28 UTC
LOCATION My backyard observatory in west Auckland, New Zealand