▁Moon ▁Bay , ▁San ▁Bruno , ▁and ▁Br is b ane ▁being ▁immediate ▁sub ur bs . ▁ ▁The ▁remaining ▁sub urban ▁area ▁of ▁the ▁Pen ins ula ▁is ▁on ▁the ▁east ▁side ▁of ▁the ▁Santa ▁Cruz ▁Mountains , ▁along ▁San ▁Francisco ▁Bay ; ▁the ▁west ▁and ▁south - central ▁port ions ▁of ▁the ▁Pen ins ula ▁are ▁mostly ▁rural , ▁un in cor por ated ▁and ▁un organ ised ▁areas . ▁ ▁A ▁substantial ▁portion ▁of ▁Sil icon ▁Valley ▁is ▁located ▁on ▁the ▁pen ins ula . ▁In ▁Sil icon ▁Valley ▁are ▁the ▁headquarters ▁of ▁some ▁of ▁the ▁largest ▁te ch ▁companies ▁in ▁the ▁world , ▁such ▁as ▁Google , ▁Y ahoo , ▁Facebook ▁and ▁Apple . ▁Over ▁the ▁last ▁de cade ▁or ▁so ▁there ▁has ▁been ▁an ▁infl ux ▁of ▁imm igration ▁into ▁the ▁Bay ▁Area ▁from ▁places ▁like ▁India ▁and ▁China ▁to ▁work ▁in ▁the ▁technology ▁industry . ▁There ▁are ▁well ▁over ▁ 6 , 6 0 0 ▁te ch ▁start ups ▁in ▁the ▁Valley ▁and ▁new ▁ones ▁are ▁created ▁every ▁day . ▁ ▁Geography ▁and ▁Transport ation ▁The ▁east ▁side ▁of ▁the ▁pen ins ula ▁is ▁a ▁dens ely ▁populated ▁and ▁largely ▁urban ▁and ▁sub urban ▁area ▁that ▁includes ▁port ions ▁of ▁Sil icon ▁Valley . ▁It ▁forms ▁a ▁comm uter ▁area ▁between ▁San ▁Francisco ▁to ▁the ▁north ▁and ▁San ▁Jose ▁to ▁the ▁south . ▁A ▁number ▁of ▁major ▁thorough f ares ▁run ▁north - s outh : ▁El ▁Cam ino ▁Real ▁( SR ▁ 8 2 ) ▁and