This page of the guide to Immortals Fenyx Rising contains a map showing the locations of all the Ambrosia located within the Grove of Kleos region.
You can find Ambrosia in 19 places in this region. The resource will be quite easy to obtain in most cases; you will often find the Ambrosia high in the mountains, or right in the open.
1 - Mountaintop
The Ambrosia is located on one of the mountains of the region; you can either climb it, or you can go to the indicated place on foot, and then jump from the highest point to the Ambrosia.
2 - Great gate
You will find the Ambrosia at the top of a building, which resembles a great gate. Before attempting to climb it, it is best to stock up on large amounts of stamina potions, since there are not many opportunities to rest and recover stamina during the climb.
3 - Leaver
100 meters from the Ambrosia there is a lever that will unlock the entrance to a small room where the Ambrosia is located. After activating the lever, you have a few seconds to dash towards the entrance and get inside. Use your mount after pulling the lever and run forward.
4 - Lone tree
The Ambrosia is located on the top of one of the hills. On the hill, there is a small, lone tree. In front of the Ambrosia, in the distance, you can see the Colosseum.
5 - Hill with Harpies
The Ambrosia is located at the top of a hill, but be mindful of the nearby harpies. If you do not feel confident enough to fight them, sneak towards the Ambrosia.
6 - Moria Tree Sanctuary
The Ambrosia is located at the top of the sanctuary by the great shield, which is suspended there. Again, you will have to climb high up in order to collect it. Use the pillars that support the sanctuary. The skill which allows you to double jump will come in handy too.
7 - Rooftop
The Ambrosia is easily accessible in this case, as it is located on the roof of a building. All you have to do is climb to the roof and pick up the resource.
8 - Spear
The Ambrosia is located on the spear of a soldier's statue. All you have to do is climb onto the spear and pick up the item. If you do not have enough stamina to complete the climb, you can use stamina potions to aid you.
9 - Goddess of Wisdom statue
Make a quick trip to the statue of the Goddess of Wisdom. While at the very top, you will see a statue of a bird below, jump down and pick up the Ambrosia.
10 - Guardian's Hill
You will find the Ambrosia on Guardian's Hill, on the roof of a building. Climb the colonnade to the roof.
11 - Cerberus
You can collect the Ambrosia after climbing on one of the statues resembling the Cerberus, a three-headed dog. You will find the item in one of its jaws.
12 - Hill near a Vault of Tartaros
The Ambrosia is located on one of the hills near a Vault of Tartaros. Simply climb the hill and pick up the Ambrosia.
13 - Isolated island
To get the Ambrosia in this case, you must glide on your wings to a nearby island. The item is located near the Constellation challenge. Jump onto the nearby monument, climb up and pick it up.
14 - Hydra
The Ambrosia is located on one of the heads of the mythical creature, the Hydra. Climb up the neck of the statue to the very top and pick up the resource.
15 - Wooden ship
The Ambrosia can be collected at the top of a mast of a wooden ship. Climb to the top of the mast and pick up the item.
16 - Pegasus statue
The Ambrosia can be found at the top of a Pegasus statue, you just need to climb to the very top and pick it up.
17 - The Archives
In this case, you can fast travel to The Archives, and from there climb to the top of the structure. You will find the Ambrosia on the roof of the building.
18 - The tallest hill
Climb to the very top of the hill that has been indicated on the map above, and then jump a little lower, using your wings to glide. There you will find a small ledge on which you can collect the Ambrosia.
19 - Statue of an instrument
The Ambrosia is located on one of the two nearby sculptures, one of them resembles a stringed instrument. Climb to the top of the statue on the left to pick up the Ambrosia.