The Arabian peninsular.
A
If you mean Islam per Quran revelation to prophet Muhammad (PBUH), then the peninsula name is Arabia peninsula. However, Islam in its broader sense began by start of universe creation. Refer to related question below.
Arabian Peninsula
Arabian Peninsula ____________________________________________________________ Islam began by beginning of universe creation as Allah (or God in English and same God in Christianity and Judaism) created all creatures on basis of submission and surrender to His will (that means Islam). However, Islam per Quran revelation to prophet Muhammad (peace be upon him) began in Arabian Peninsula. Refer to related question below.
In the Arabian Peninsula to the South West of Asia.
islam
The Arabian peninsula.
The Arabian Peninsula which is Saudi Arabia now
Arabian Peninsula (Saudi Arabia)
islam
Isian most of the states on the Aranian Peninsula.
Islam did not in fact first develop on the Italian peninsula. It first arose in its distinctive form in the 7th century CE (or, AD) within the Arabian Peninsula in what is now known as Saudi Arabia.