Which of the constellations is the largest? (seen from the ground)

Big Dog
209
Hydra
826
Orion
550
Great Bear
722
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. Also one of the longest at over 100 degrees, It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake.
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