Just a short hop from the Indonesian holiday hotspot of Bali, a Saudi tourist and his family listen to the call to prayer as the sun goes down on Lombok, the self-styled "island of 1,000 mosques".

Lombok is at the center of an Islamic tourism drive in Indonesia, which has the world's biggest Muslim population and is hoping to boost the number of visitors from wealthy Middle Eastern countries.

While aiming to continue to attract Western tourists who flock to its pristine beaches, the island is also seeking to promote its Islamic heritage, from numerous places of worship to shrines dedicated to ancient Muslim preachers.