None.
A square kilometre is a measure of area. The tonnage depends on the volume of water, not the area that it is spread over. The height of the water column is also required.
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Answer: 1 km² = 0.386102 mi²
0.0040469 square km
Answer: 35 square km = 3,500 hectares
809,444 km² or 312,528 sq miles.
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