The south-eastern side is a divergent boundary with the Nazca plate forming the East Pacific Rise.

[citation needed] The southern side is a divergent boundary with the Antarctic plate forming the Pacific–Antarctic Ridge.

The southern part of Zealandia, which is to the east of this boundary, is the plate's largest block of continental crust.

[3] The Pacific plate has the distinction of showing one of the largest areal sections of the oldest members of seabed geology being entrenched into eastern Asian oceanic trenches.

The oldest part disappearing by way of the plate tectonics cycle is early-Cretaceous (145 to 137 million years ago).