What is associated with: at about 3700?

Based on the clue 'at about 23 of a square mile upper lake is the sma...', what is the answer? Based on the clue 'at about 230 miles its not only the longest river ...', what is the answer? What is associated with: at about 25000 feet down the cayman trench is the deepest part of this sea? What is associated with: at about 29000 ft the summit of this nepalese peak reaches 23 of the way throught the earths t… Based on the clue 'at about 4 12 feet in height 180 pounds this red ...', what is the answer? Based on the clue 'at about 40 barbra streisand played this title gir...', what is the answer? Based on the clue 'at about 40 miles in width the isthmus of kra in s...', what is the answer? Based on the clue 'at about 40 percent this christian denomination is...', what is the answer?