Which peninsula in western Turkey was the site of the 1915 Gallipoli campaign?

The peninsula in western Turkey that was the site of the 1915 Gallipoli campaign is the Gallipoli Peninsula.

The peninsula, called Gelibolu in modern Turkish, lies on the European side of the Dardanelles in northwestern Turkey. Its strategic position beside the strait made it a gateway toward Constantinople and the Sea of Marmara, giving it major military importance during the First World War.

The Allied campaign began with naval operations in February 1915 and amphibious landings on 25 April. British, French, Australian and New Zealand forces fought Ottoman defenders in difficult terrain before the Allied evacuation was completed in January 1916. The campaign ended in an Ottoman victory and became especially significant in the historical memory of Turkey, Australia and New Zealand.

The Biga Peninsula lies across the Dardanelles in Asia Minor, so it is geographically nearby but not the campaign site. Gallipoli is also the name of the nearby town and the campaign itself, which can cause confusion between the place and the military operation.