2 mi2 x 2 in = 9.293x106 ft3 = 6.951x107 gallons
About 220 gallons of water, filled to the very top.
Square inches is an area, not a volume. You can't convert square inches to gallons. If you meant CUBIC inches, then 682 cu in is 2.95 US Liquid gallons or 2.53 US Dry Gallons.
The height of 400 gallons of water would depend on the shape of the container. 400 US gallons has a volume of about 206,000 cubic inches, so if the inside of the container was about 59 inches square, it would also be about 59 inches high.
There are billions of gallons of water within the Indian Ocean. This ocean covers an area of 47,900,00 square miles.
40 square feet * 2 inches = 40*(1/6) = 6.66... cubic ft = 41.5 UK gallons or 49.9 US gallons (approx).
There are 17.66 gallons in 4,080 cubic inches of water.
There are 25.71 gallons of water in 5,940 cubic inches.
There are about 49.87 gallons in 11,520 cubic inches of water.
489.76 gallons of water.
58.75 gallons of water.
1,049.1 gallons of water.
165.7 gallons of water.