In the Pacific Ocean, or near it, of course, consult any map of the Pacific theater of World War II. What has this waterway to do with Cats, methinks?

Most likely the Bataan Death March would be part of the Pacific Ocean Theater of World War II, as this theater is between the Allies and Japan, the latter occupying the Philippines during the war.

Midway

While there was little of World War I in the Pacific, Douglas MacArthur oversaw much of the Pacific theater in World War II. He was eventually the Supreme Commander of forces there.

The Pacific war refers to the theater of war involving the pacific Ocean, and East Asia during the Second World War. Principally it is meant to include the battles and campaigns starting from the Japanese attack on Pearl Harbor in December 1941, and ending at the surrender of the Japanese Empire after the atomic bombings of Hiroshima and Nagasaki in September of 1945.

Additionally the Term Pacific war can include the war fought between China and Japan from 1936 through the rest of WW2.