What was the largest amphibious operation in the Pacific?

The largest amphibious operation in the Pacific was indeed at Okinawa. This battle, which took place from April to June 1945, involved a massive deployment of naval and ground forces, making it one of the most extensive and complex operations during World War II. The scale of the operation at Okinawa was unprecedented, involving around 180,000 troops, including Army, Navy, and Marine Corps units, as well as significant naval support with thousands of ships—including aircraft carriers and destroyers—surrounding the island.

Okinawa's strategic significance stemmed from its proximity to the Japanese home islands, providing a forward base for operations and supporting the eventual plan for the invasion of Japan. The intense fighting, characterized by fierce resistance from entrenched Japanese forces, led to high casualties on both sides and demonstrated the brutal nature of amphibious warfare, including the challenges of logistics, coordination, and sustaining operations in a hostile environment.

Other operations, such as those at Peleliu, Iwo Jima, and the Marshall Islands, while also significant, did not match the sheer size and complexity of the Okinawa campaign. Each of those battles had its importance and unique circumstances, but Okinawa remains notable as the largest in terms of troop commitments and overall