Rock X is a prominent offshore rock 0.4 miles (0.6 km) long, lying close inside the east side of the entrance to Victor Bay

Victor Bay

Victor Bay is a bay about 16 nautical miles wide and 7 nautical miles long, indenting the coast between Pourquoi Pas Point and Mathieu Rock, Antarctica. The bay is marked by an extensive chain of icebergs breaking away from the high tongue of Commandant Charcot Glacier. It was delineated from...

, 1 mile (1.6 km) northwest of Gravenoire Rock

Gravenoire Rock

Gravenoire Rock is a small rock outcrop about 1 nautical mile southeast of Rock X, protruding above the coastal ice at the east side of Victor Bay. Photographed from the air by U.S. Navy Operation Highjump, 1946-47...

, on the Antarctic coast. It was photographed from the air by U.S. Navy Operation Highjump, 1946-47, and charted by the French Antarctic Expedition

French Antarctic Expedition

French Antarctic Expedition refers to several French expeditions in Antarctica.-First expedition:Yves-Joseph de Kerguelen-Trémarec was a French explorer....

 under Marret, 1952-53. The rocked was so named because the rock was indicated by a cross or "X" mark in selected prints of the Operation Highjump

Operation Highjump

Operation Highjump , officially titled The United States Navy Antarctic Developments Program, 1946-1947, was a United States Navy operation organized by RADM Richard E. Byrd Jr. USN, , Officer in Charge, Task Force 68, and led by RADM Richard H. Cruzen, USN, Commanding Officer, Task Force 68....

photographs for the purpose of identifying it to the French Antarctic Expedition party which established an astronomical control station there.