Ezekiel Chapter 42 Vs. 15

 The Temple's Chambers

Now when he had made an end of measuring the inner house, he brought me forth toward the gate whose prospect is toward the east, and measured it round about. Eze 42:15

This gate is on the outer wall. This would be the eastern gate.

The outer walls of the temple

After the angel measured everything within the temple complex, he led Ezekiel outside to record the external dimensions of the temple.