WI: POD Made all OTL Islands on the Ring of Fire A massive Peninsula or Island?

POD: Prehistory&prior to Human settlement,The Islands on the Ring of Fire endure greater levels of Volcanic&Tectonic activity during their formation.As A result of these events,The OTL Islands continued to grow in height&mass eventually forming an unbroken Peninsula attached to OTL China&Korea.Over time the link to the Mainland Submerges,Drifts&Ceases to be,Changing the Peninsula into A huge Island.How will this POD effect World History?What Evolutionary divergent Flora&Fauna will the Island have?
 
POD: Prehistory&prior to Human settlement,The Islands on the Ring of Fire endure greater levels of Volcanic&Tectonic activity during their formation.As A result of these events,The OTL Islands continued to grow in height&mass eventually forming an unbroken Peninsula attached to OTL China&Korea.Over time the link to the Mainland Submerges,Drifts&Ceases to be,Changing the Peninsula into A huge Island.How will this POD effect World History?What Evolutionary divergent Flora&Fauna will the Island have?

it depends on where youve situated the island in the modrn day
 
Are we talking about the entirity of the Pacific Ring of Fire here? Because the simple fact is that tectonic forces and ocean currents are going to break that apart.
 
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