Sabarimala is believed to be the place where the Hindu God Ayyappan meditated after killing the powerful demoness, Mahishi. Ayyappan's temple is situated here amidst 18 hills. The temple is situated on a hilltop at an altitude of 468 m (1535 ft) above mean sea level, and is surrounded by mountains and dense forests. Temples exist in each of the hills surrounding Sabarimala. While functional and intact temples exist at many places in the surrounding areas like Nilackal, Kalaketi, and Karimala, remnants of old temples survive to this day on remaining hills.
Sabarimala is linked to Hindu pilgrimage, predominantly for men of all ages. Women between the ages of 10 and 50 are not allowed to enter the temple, since the story attributed to Ayyappa prohibits the entry of the women in the menstrual age group. This is because Ayyappan is a Bramachari (Celibate). The temple is open for worship only during the days of Mandalapooja (approximately November 15 to December 26), Makaravilakku (January 14- "Makara Sankranti") and Vishu (April 14), and the first six days of each Malayalam month.
The devotees are expected to follow a vratham (41-day penance) prior to the pilgrimage. This begins with wearing of a special Mala (a garland made of Rudraksha or Tulasi beads). In general from then they are to refrain from non-vegetarian food of any kind (except dairy) alcohol, and tobacco, engaging in sex, using foul language, hair-cuts and shaving. They are expected to bath twice and visit the local temples regularly and only wear plain black, blue or saffron coloured traditional clothing. The visit to Sabarimala is thought for settling the shani-dasha to make the planet give better life and lifespan. This is according to astrological principles of controlling shani-dosha.
Hundreds of devotees still follow the traditional mountainous forest path (approximately 52 km) from Erumely, believed to be taken by Ayyappa himself. The part starts from Erumely to Aludha river, then crosses the Aludha mountain to reach Karivilam thodu. Now comes the sacred Karimala crossing, from there to Cheriyanavattom, Valliyanavattom and finally Pamba River. Then have claim neeleemala and we enter into the ganesh bettam, shreeram betta padam. Aranmula kottaram is one of the halt place of holy journey 'thiruvabharana khosayatra'. But many people use vehicular traffic which can go till the Holy Pamba River by an alternate road. Thereafter, all the pilgrims have to follow a mountainous forest trekking path approximately nine kilometers up a steep hill (Neeli Mala) to Sabarimala. This path, now developed, with shops and medical aid by the sides, used to be a mere trail through dense forest.