The possible cause of the crash is under investigation and no other details were revealed. The Algarve is the most popular tourist destination in Portugal, and one of the most popular in Europe. It receives an average of 7 million foreign tourists each year. In total, including national visitors, almost 10 million people visit the Algarve annually. Many of these tourists own their own property in the region. The Algarve covers 4997 square km, extending just south of the Tagus valley to the southern coast of the Iberian Peninsula. The length of the south-facing coastline, with many caves and grottoes, is approximately 155 kilometers. The Algarve is also famous for its pottery and ceramics.