Name: Ahch-To
Region: Unknown Regions
Suns: 2
Moons: 1
Atmosphere: Breathable
Primary terrain: Aquatic, Rocky islands
Surface water: Oceans
Points of interest: Temple island
Fauna: Ahch-Tonian grubs, Fingerlip garpon, Porgs, Spetan channelfish, Thala-siren, Twinfin hyacander
Native species: Lanai
Immigrated species: Human
Demonym: Ahch-Tonian

Description: Ahch-To was a planet mostly covered in water, with numerous rocky islands blanketed with green trees located in the Unknown Regions. It was the birthplace of the Jedi Order and held the ancient Jedi texts. Three decades after the Galactic Civil War, it served as the home of Jedi Master Luke Skywalker who went into exile seeking the first Jedi Temple after his Jedi students were killed by Kylo Ren. After the Resistance pieced together two map fragments to reveal Skywalker's location, Rey traveled to Ahch-To in the Millennium Falcon accompanied by R2-D2 and Chewbacca, in search of him.

From space, Ahch-To appeared to be a world of nothing but deep blue oceans orbiting twin stars. Dotting the oceans, however, were rocky island archipelagos covered with green trees and grass, where birds such as Porgs would congregate. The first Jedi Temple was built on one such island, known as Temple Island. By the time of the conflict between the First Order and the Resistance, Temple Island was dotted with Jedi ruins.

The planet was the homeworld of a large variety of creatures, such as the mysterious Lanai and the large thala-siren.

Ahch-To was the birthplace of the Jedi Order. Before the Jedi Purge and the Age of the Empire, Jedi scholars argued that a number of locations could be considered the birthplace of the Order. The scholars argued that Ahch-To, Tython, Coruscant, Jedha, and Ossus could all be considered candidate worlds for the Order's birth and the location of the first Jedi temple. Despite much deliberation, however, the location of the first Jedi temple was a mystery by the time the Galactic Civil War came to a close. Following the failed attempt by Jedi Master Luke Skywalker to rebuild the Jedi Order, Skywalker vanished and went in search of the first Jedi temple. He entered into a self-imposed exile on Ahch-To, residing on an island with stone ruins.

As the Resistance began its fight against the First Order, General Leia Organa, Skywalker's sister, hoped to find her brother and bring him back into the fight against the dark side. She sent Commander Poe Dameron to Jakku, where he retrieved a partial map held by Lor San Tekka that gave part of the direction to Ahch-To. Later, after the partial map was given to the Resistance, Skywalker's astromech droid R2-D2, who had been in low power mode since Skywalker's exile, returned to full power and provided the rest of the map to Ahch-To. R2-D2 unknowingly had the map in his databanks for many years, having found it in the network of the Galactic Empire aboard the Death Star during the Galactic Civil War. Rey, a young Force-sensitive scavenger, took the map and traveled to Ahch-To, where she found Skywalker in his exile.

After training Rey, Skywalker opted to remain on the planet rather than travel to Crait to fight the First Order. After being visited by the spirit of Jedi Master Yoda, Skywalker projected himself to Crait to interact with the Resistance and with his fallen pupil Kylo Ren. Projecting himself required a massive amount of Force energy and ultimately led to his demise, although Luke found inner peace and purpose in his final moments as he gazed upon Ahch-To's binary sunset and became one with the Force.