Covering 238.9 square degrees and hence 0.579% of the sky, Antlia ranks 62nd of the 88 modern constellations by area.[13] Its position in the Southern Celestial Hemisphere means that the whole constellation is visible to observers south of 49°N.[13][lower-alpha 2] Hydra the sea snake runs along the length of its northern border, while Pyxis the compass, Vela the sails, and Centaurus the centaur line it to the west, south and east respectively.