Hallen, Gloucestershire
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Hallen is a village near the northern Bristol city boundary, but is actually in South Gloucestershire. It is southwest of Easter Compton and northeast of Avonmouth. Henbury (in Bristol) is located to the southeast of Hallen. The village is sandwiched between the M49 and M5 motorways and lies on the Severn floodplain.
A large underground petroleum storage facility was built into the hillside behind the village during World War II, to provide protection from German bombing. The facility is still in use today.