Shop areas of Akihabara defined by akibamap.net.
Although unofficial area definitions, it is useful to locate small shops, because operational district of Akihabara is very complicated.

original file: An aerial photograph near JR Akihabara Station in 1989.
http://nrb-www.mlit.go.jp/Air/photo400/89/ckt-89-3/c5/ckt-89-3_c5_32.jpg (WebGIS2.0 (ckt-84-3,#32))
Ministry of Land, Infrastructure, Transport and Tourism, Japan