מדרש על יחזקאל 43:17

8) (Vayikra 1:11): "And he shall slaughter it at the foot of the altar northward": The foot was in the north. And where was the face? In the south — whence we derive that the ramp was in the south. R. Yehudah says (Ezekiel 43:17): "And its rising turned to the east." One who ascended it, turned to his right, to the east — whence we derive that the ramp was in the south.