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The Fossilized Shells Of What May Be The Largest Turtle To Ever Exist On Earth Have Been Found In Venezuela And Colombia. The Giant Turtle, Named Stupendemys Geographicus, Is Said To Have Lived ~5 To 10 Mya. The Shell Is Nearly 10 Feet In Length And Weighed 2,500 Pounds. The Male Shells Are Honed To Protect Their Skulls During Fights.

Biggest turtle that ever lived had 10 foot shell with horns – CNN

https://www.cnn.com/2020/02/12/world/ancient-giant-turtle-shell-scn/index.html

About five to ten million years ago, giant turtles that dwarfed humans reigned supreme in South America. Its shell reached nearly 10 feet in length and weighed 2,500 pounds.