The
Wright Valley, named for
Sir Charles Wright, is the central one of the three large
Dry Valleys in the
Transantarctic Mountains, located west of
McMurdo Sound at approximately . Wright Valley contains the
Onyx River, the largest river in
Antarctica,
Lake Brownworth, the origin of Onyx River, and
Lake Vanda, which is fed by the Onyx River. Its southwestern branch,
South Fork, is the location of
Don Juan Pond. The upland area known as the
Labyrinth is at the valley's west end.