This is the gift of the river. If you build boats you can sail to the sea and become the most powerful humans on earth
Taste the water. It is Salt Water which is disgusting and imposiple to drink.
This is an Olive Tree. It has wood great for building homes and is great for heating those houses in the winter. It also has little green fruits called Olives that are delicious and the oil in those Olives is great for cooking.
The Mortals Liked Athena's gift better than Poseidon's so not only did they pick Athena to watch over them but they named the city Athens after Athena.
Poseidon leftin a huff causing a serious flood but the Athenians didn't care because they were to happy about finally having a goddesss to watch over them!