The Kyamwilu Hill mystery: Machakos road where gravity seems to fail

MACHAKOS, Kenya - A stretch of road near Machakos town has long puzzled motorists, tourists and scientists alike.

At Kyamwilu Hill, vehicles left in neutral appear to roll uphill. Water poured on the road seems to flow against gravity.

The unusual phenomenon occurs along the Machakos–Kangundo road, about 12 kilometres from Machakos town.

Located roughly 65 kilometres from Nairobi, the site has become one of Machakos County’s most intriguing roadside attractions.

Visitors frequently stop to test the strange effect for themselves.

Many switch off their engines and place vehicles in neutral gear. To their surprise, the cars begin to move uphill.

Pouring water on the road produces another strange sight. The liquid appears to flow against the slope.

Optical illusion

Scientists say the mystery is most likely caused by an optical illusion.

The surrounding landscape distorts the human eye, making a gentle downhill slope appear like an uphill climb.

As a result, vehicles are actually rolling downhill, even though they seem to be moving uphill.

Similar “gravity hills” exist in several countries around the world.

Local legend

Despite the scientific explanation, the hill is deeply rooted in local folklore.

Residents tell the story of two brothers, Kyalo and Mwilu, who fell in love with the same woman, Mwenda.

The brothers lived on opposite sides of the hill and rivalry between them grew over time.

When Mwenda died, locals say she was buried between the two homes.

According to the legend, the unusual forces at the hill reflect the brothers’ eternal struggle for her attention.

The story remains popular among residents and visitors.

Tourism opportunity

The mystery has also created a small tourism economy for local residents.
Groups of guides gather near the site each morning waiting for travellers to stop.

They demonstrate the phenomenon and explain the history behind the hill.

Peter Kiluku, a resident of Kyamwilu village, says the site attracts both local and foreign tourists.

Another guide, Mr Alex Muli, said they charge visitors a small fee to demonstrate the phenomenon.

“We charge about Sh300 for local tourists and between Sh3,000 and Sh4,000 for foreigners,” he said.
“Many people are amazed when they see vehicles apparently moving uphill without a push.”

Discovery story

Residents say the strange behaviour was first noticed during the colonial era.

According to local accounts, a settler once parked his vehicle along the stretch while fetching water from a nearby stream to cool his overheated engine.

When he returned, he found the vehicle had rolled several metres uphill.

The discovery quickly spread among residents and travellers.

Today, the short stretch of road — barely 100 metres long — continues to fascinate visitors.

Some run uphill to test the effect. Others pour water or roll bottles along the road.

Whether explained by science or folklore, the Kyamwilu Hill mystery remains one of Kenya’s most unusual roadside attractions.

Officials from the Machakos County Department of Tourism could not be reached for comment by the time of publication.