Yankin Babban Birnin Jingjinji ko Jing-Jin-Ji ( JJJ ), wanda aka fi sani da Beijing-Tianjin-Hebei ( BJ-TJ-HB ) kuma a matsayin Yankin Tattalin Arziki na Babban Birnin, shine Babban Birnin Ƙasa na Jama'ar Jamhuriyar Sin . Ita ce babbar yankin tsakiya na birni a Arewacin China . Ya haɗa da yankin tattalin arziki da ke kewaye da gundumomin Beijing da Tianjin, a gefen Tekun Bohai . Wannan yanki mai tasowa yana tasowa yayin da yankin babban birni na arewa ke hamayya da Kogin Pearl na Delta a kudu da Delta na Kogin Yangtze a gabas. A cikin 2016, Jingjinji tana da yawan jama'a miliyan 112 kuma tana da yawan jama'a kamar Guangdong, lardin China mafi yawan jama'a. A shekarar 2019, Jingjinji ya samar da kusan kashi 8% (na dalar Amurka tiriliyan 1.2 ko tiriliyan 2.0 a cikin PPP ) na tattalin arziƙin GDP na ƙasar Sin ko kusan girmansa ya kai ƙasar  Spain, mamaye yanki game da girman Ƙasar Ingila . Jingjinji ya saba shiga manyan masana'antu da masana'antu . Ƙarfin Tianjin kasance koyaushe a cikin jirgin sama, dabaru, da jigilar kayayyaki .