The power of Poseidon. He's a jerk, but he sure knows how to sweep pollution away.

–East River, talking about Poseidon's power in The Last Olympian

The East River Spirit is the rival of the Hudson River Spirit. He looks disturbingly like a Telkhine.

Percy Jackson and the Olympians

The Last Olympian

Percy Jackson asks him and the Hudson River Spirit to sink all of the Titan ships and their allies that try to cross the rivers. In exchange, Percy gives each half of a sand dollar, that his father, Poseidon, gave Percy for his fifteenth birthday. After both spirits quickly agree, Percy splits the sand dollar between them. The East River Spirit calls Poseidon a "jerk", but acknowledges his amazing power to sweep pollution away. Holding their side of the bargain, both river spirits stop the ships and monsters from crossing, forcing Kronos to use a ground assault.

The Heroes of Olympus

The Mark of Athena

The East River Spirit is mentioned briefly by Percy.


  • Hydrokinesis - As a river spirit, he can control and manipulate water as well as the pollution and garbage in it.
Percy Jackson and the Olympians
Core Series: The Lightning Thief | The Sea of Monsters | The Titan's Curse | The Battle of the Labyrinth | The Last Olympian
Main Characters: Percy Jackson | Grover Underwood | Annabeth Chase | Tyson | Clarisse La Rue | Thalia Grace | Nico di Angelo | Chiron | Luke Castellan | Rachel Elizabeth Dare
Minor Characters: Travis Stoll | Connor Stoll | Mrs. O'Leary | Silena Beauregard | Charles Beckendorf | Sally Jackson | Paul Blofis | Blackjack | Zoë Nightshade | Bianca di Angelo | Juniper | Michael Yew | Ethan Nakamura
Olympian Gods: Zeus | Hera | Poseidon | Demeter | Ares | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus | Hades | Hestia
Minor Gods: Amphitrite | Ariadne | Hecate | Iris | Janus | Morpheus | Nemesis | Pan | Persephone | Triton
Titans: Kronos | Atlas | Calypso | Iapetus | Krios | Hyperion | Oceanus | Prometheus
Related Content: Rick Riordan | The Lightning Thief (film) | The Sea of Monster (film) | The Demigod Files | Demigods and Monsters | The Ultimate Guide | The Heroes of Olympus