This is known as The World's Biggest Hole, albeit being man made and it's located in Russia. It's a diamond mine in Eastern Siberia near the town of Mirna and is 525 meters deep and 1.25 kilometers in diameter.
As seen from Google EarthThe Mirna Diamond Mine is the deepest open pit diamond mine in the world. It takes approximately 1 1/2 to 2 hours for an ore truck to drive from the bottom of the mine to the upper rim. Mira (Mir or Peace) is the oldest diamond mine in this region. The first discovery of kimberlite in the Sakha region occurred in 1954. The Mir kimberlite field was discovered in 1955. Opened in 1957, the Mirna mine has ceased operation since its exhaustion. While in operation the mine had an averaged yield of 2 million carats annually.
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