The maximum run-up height of the 1960 Valdivia tsunami in Chile was 25 meters. Run-up is the highest elevation above normal sea level reached by tsunami water on land, so it is not exactly the same as the height of a wave measured offshore.
The tsunami followed the 22 May 1960 Valdivia, or Great Chilean, earthquake, the strongest earthquake ever recorded, with an estimated moment magnitude of about 9.4–9.6. The megathrust rupture along the Chilean subduction zone displaced the seafloor and generated powerful waves along the Chilean coast.
The disaster was both local and transoceanic. Coastal Chile suffered waves up to 25 meters, while the tsunami crossed the Pacific and struck Hawaii, Japan, the Philippines, New Zealand, Australia, and the Aleutian Islands. Hilo, Hawaii, recorded waves reaching about 10.7 meters.
A common mistake is to treat 25 meters as the tsunami's uniform height. Run-up varied greatly with coastal shape, bays, cliffs, tides, and local amplification. The number describes the highest reported inland reach in Chile.