The Lowland Tsunami

On Prill 4, 2112NG, the smallest volcano in an eastern archipelago erupted violently for the first time in a thousand years, blowing the cap off of the mountain that had been forming above the magma vault for all that time.

Of course, a thousand years is not a long time on a geological timescale. But as far as anyone who had been living on the archipelago was concerned, it was armageddon. All life on the island at the time perished, and the surrounding islands began to blow, one after the other, in quick succession, until finally the ceiling of the subterranean lava chamber collapsed, pouring seawater into the now exposed caldera. The result was an explosion and gout of steam that could be heard and seen from over a hundred miles away.

The tsunami this caused was a massive wall of water, followed by five smaller but perhaps even more destructive waves that smashed coastlines half a world away. Entire seaside towns and villages were wiped out in an instant, for thousands of miles around, but the worst of it was borne by the Lizardfolk of The Nyssan Jungle.

Manifestation

The first wave reached a height of nearly one hundred feet before it impacted the land, wiping out the eastern Taishan coast in an instant. The water had travelled inland hundreds of yards before the second wave of tsunamis hit, and drove it in even further.
And then the third hit.
And then the fourth. Then the fifth.
Every lizardfolk village on the seaboard was wiped out. The seawater flooding the lowlands poisoned many of the more delicate plants, and outright killed much of the floating vegetation, further impacting the lizardfolk's livlihood for years to come.

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Localization

Lizardfolk scholars say more than seventy percent of their population perished in a single day, and a further half of the remainder in the three years of starvation that followed. The fact that they have survived at all is a testament to their ingenuity, tenacity, and reproductive malleability.