Hill 40 is one of the smaller features of the War in the Pacific National Historical Park, marking a low rise just inland from Agat that the Marines fought to secure on the second day of the 1944 landings. The name comes from its height in feet on the wartime maps — the Marines numbered the hills as they took them. The position controls the road and was held by Japanese infantry who had retreated from the beach.
There is little to see today beyond a clearing and an interpretive panel, but the spot is worth a brief stop for anyone following the sequence of the campaign — it links what happened on the sand at Gaan Point to the bigger fighting that followed on the ridges of Mount Alifan above. Combine it with the other Agat-unit sites on a single morning loop.