Lake Chagan: 400 m (1,300 ft) across and 100 m (330 ft) deep Sedan Crater: 390 m (1,280 ft) across an 98 m (320 ft) deep I was under the impression the Sedan

Lake Chagan: 400 m (1,300 ft) across and 100 m (330 ft) deep Sedan Crater: 390 m (1,280 ft) across an 98 m (320 ft) deep I was under the impression the Sedan Crater was the largest manmade crater, but Lake Chagan seems to win by a hair. I'm surprised I never heard of Lake Chagan before.