Bikanel Island
Bikanel is a large island on the west side of the continent of Spira. It contains the Sanubia Desert and the Al Bhed Homeworld of Home.
The story takes you through Bikanel after the team manages to escape from the Lake Macalania Temple. Use either of the links below for more information. Both of these sections of the game take place on the Island of Bikanel:
Walkthrough Guide
The Sanubia Desert is located on Bikanel Island, where you must track down each of your team members on the way to Rikku’s hometown.
You will also need to complete the Village of the Cactuars side quest in this area:
Side Quests
Complete the Cactuar Village side quest to obtain the Mercury SigilVenus Sigil, one of the pieces of Rikku’s Celestial Weapon, Godhand.
This is also where you will pick up the 
Mercury CrestVenus Crest. This item is needed later on to obtain Rikku’s Celestial Weapon, the 
Godhand.
Note that this is where you’ll find the Mercury CrestVenus Crest and Mercury SigilVenus Sigil in the 
PlayStation
Xbox
Nintendo Switch version of the game. In the Xbox and Nintendo Switch versionsIn the PlayStation version, these items are swapped for the Venus CrestMercury Crest and Venus SigilMercury Sigil. You can change the active version using the Game Version toggle in the sidebar menu. Refer to the Celestial Weapons section for a full breakdown of the differences.