Wadi Al Jinn (Lembah Jinn) di Madinah terkenal sebagai Bukit Magnet, tempat dimana mobil seolah2 dpt mendaki tanpa bantuan mesin. Penjelasannya adalah ilusi penglihatan dimana turunan landai terlihat seolah-olah seperti pendakian.
Hamparan rata sepanjang 14 km yg dikelilingi bukit2 di kiri kanan sebagai akibat aliran sungai purba yg membawa kerikil2 dari gunung sekitar menuruni bagian rendah (ke arah Madinah). Hamparan tsb terlihat datar, atau sebaliknya mendaki padahal sudut panjang menurun tidak terlihat dgn jelas krn gunung2 disekitar terlihat lebih menonjol mengubur citra hamparan landai yg menurun., dimana dibagian bawahnya menjadi daerah subur dgn tanaman2 kurmanya.
Bukan hanya Bukit Magnet, Madinah juga memiliki struktur geologi lainnya yg cukup unik. Disebelah selatan dan timur kota anda akan melihat batuan2 hitam magma terhampar sangat luas. Pada abad-12 kota Madinah hampir terbakar magma panas merah membara yg keluar dari celah2 rekahan dari dlm bumi.
==
Wadi al Jinn (Valley of Jinns) in Madinah famous as Magnetic Hill, known for it's optical illusion that the car pulled like against the gravity. The explanation is surrounding hill was slope gently that descending seem optically like ascending.
It is 14 km smooth terrain surrounded by hill, the terrain seem as the result of river path down hill from the surrounding mountains that carry debris top soil that make the path smooth and sloping gently perhaps 15 degrees. Along the path is fertile area with green Date plantation contrast to the surrounding hill.
Not only Magnetic Hill, surrounding Madinah have a lot of interesting geological "odd"shape. The history tell that the city surrounding experienced lava flowing in which, the last one was 12th century that almost burnt the city. The nearby mountain found a dormant volcano as well as whitey mountain that made from gypsum deposit.
