The traditional Garden of Gethsemane on the western slope of Mount Olivet.
And they went to a place called Gethsemane. And he said to his disciples, “Sit here while I pray.” And he took with him Peter and James and John, and began to be greatly distressed and troubled. And he said to them, “My soul is very sorrowful, even to death. Remain here and watch.” And going a little farther, he fell on the ground and prayed that, if it were possible, the hour might pass from him. (Mark 14:32-35 ESV)
If Jesus was not at this specific spot, it could not have been far away.
For the full account read Mark 14:32-46 and Matthew 26:36-46.