On this page of our treasure guide to Uncharted 3 Drake's Deception you can find valuable information about all collectibles available in chapter 22. The final level of the main campaign has two last treasures to collect - Gold Cup from Ur and Golden Hittite Goddess.
Gold Cup from Ur
At the beginning of the chapter look under the stairs from the previous level. There is a treasure lying near a column .
Golden Hittite Goddess
After meeting with Sullivan, you will take the elevator to move down. Then, go under the water pumping machine .
When you reach the crossroads  you have to go right in order to find the last treasure. It lies under a closed gate .