If you mean 139 x 200 feet, that's 27,800 sq ft, which is roughly 64/100 of an acre.
If you mean 139 x 200 miles, that's 27,800 sq miles, which is 17,792,000 acres
An acre is 1/640 of a mile, 4047 sq meters, 43,560 sq feet.
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About 13.54 acres.
200 ft * 900 ft = 4.13 acres (to 2 dp).
1 acre is 43560 ft2, so: 200 ft x 7900 ft = 1580000 ft2 = (1580000 / 43560) acres ≈ 36.27 acres
7.413 (rounded)
143,875,000 acres