School District 21

is the westernmost School District of Academy City. The district's primary use is for water storage,Toaru Majutsu no Index no Subete: Map of Academy City and astronomical observation facilities.Toaru Majutsu no Index: Road to Endymion Chapter 4 Part 2
==Principles==
Unlike School District 23, which is flat due to its many runways, School District 21 is a mountainous area. The mountainous area holds many dams that act as the city's water source. The water is distributed to the whole of Academy City using pipes, from uses such as beverage service to industrial use.Toaru Majutsu no Index no Subete
The stars in the night sky can be seen more clearly in the district than the rest in the city.Toaru Majutsu no Index: Mars SS Perhaps because of this, the district contains several astronomical observation facilities. The area is also the location of an experimental geothermal power station situated on the mountain's peak, Chapter 1 Part 2 Between the Lines 2 and a large-scale meteorological observatory, which is also the base for the disaster recovery group Useful Spider. Chapter 3 Part 4
The district also keeps wilds animals due to its mountainous area.
==Chronology==
===Toaru Majutsu no Index===
====DRAGON Arc====
===Shinyaku Toaru Majutsu no Index===
====Kamisato Rescue Arc====
===Toaru Anbu no Item===
====Honey Queen Arc====
Between August 5th and 6th, one year prior to the main story, Item rented a cottage in the mountains of the district as a temporary base during the mission against Honey Queen, after the initial airship reservation proved unpopular in the face of an approaching typhoon. Chapter 2 Part 4 Chapter 4 Part 2
====Dark Justice Arc====
On August 29th, Item visited the district to raid a dark side bond builder, based out of an RV in the district, for information on a recent client and Item's current enemy, Sadistic Dolls. Chapter 1 Part 2 Chapter 1 Part 3
==Known Locations==
Location 	Type 	Details
Nature Park 	Park 	
Ground Geo 	Power Station 	
Mars World 	Research Facility	
 	 	Chapter 3 Part 3
Matsuo Ryuusuke's log cabin	 	A log cabin near Ground Geo which acted as a secret hideout for L.S.S. president and Biohacker Matsuo Ryuusuke, and contained many of his created specimens. Destroyed by the Beginning Child after her awakening.Toaru Majutsu no Index SS: Biohacker Chapter 5
==References==
==Navigation==
Category:Locations
Category:Academy City Locations
Category:School Districts