A liquid supply apparatus a tank and a cartridge attachable to the tank along an attachment direction crossing a vertical direction. The ink cartridge includes a first storing chamber configured to store liquid therein. The tank includes a second storing chamber configured to store liquid therein, a liquid channel and an air channel, which both communicate with the second storing chamber. When the cartridge is attached to the tank with the first storing chamber of the cartridge communicating with the liquid channel and the air channel, the first storing chamber has a portion located above the liquid channel and the air channel. The second storing portion has a first area located above a lower end of the first storing chamber of the cartridge in the vertical direction and a second area continuous with the first area and located below the first storing chamber of the cartridge in the vertical direction.