Wādī al-Ḥītān, also known as "Wadi of the Whales" in Arabic, is a fossil site located in the Faiyum Governorate of Egypt. It is about 150 kilometers (93 miles) southwest of Cairo. In July 2005, it was named a UNESCO World Heritage Site because of the many fossils found there. These fossils belong to some of the earliest whales, called archaeoceti, which are now extinct. The site helps scientists understand a major mystery in whale evolution: how whales changed from living on land to living in the ocean. No other place in the world has as many, well-preserved fossils, or as easy access to them in such a beautiful and protected area. Because of this, the valley was added to the UNESCO World Heritage List in 2005.

History

The fossils found at the site may not be the oldest, but there are many fossils in the area, and some are so well-preserved that even stomach contents can be seen. The presence of fossils from other early animals, such as sharks, crocodiles, sawfish, turtles, and rays at Wādī al-Ḥītān helps scientists understand the environment and ecosystem from that time, supporting its recognition as a Heritage site.

The first whale skeletons were discovered in the winter of 1902–03. For the next 80 years, the area received little attention because it was hard to reach. In the 1980s, interest in the site grew again when four-wheel drive vehicles became more common. Continued interest happened as fossil collectors visited the area, and many bones were taken, leading to calls for better protection of the site.

The remains show the long, smooth body shape of modern whales but also have some features similar to older animals, such as parts of the skull and teeth. The largest skeleton found was about 21 meters long, with well-developed five-fingered flippers on the front limbs and the surprising presence of hind legs, feet, and toes, which were not seen in other ancient whales. These whales had a snake-like body shape and were meat-eaters. Some bones are visible, but most are buried in sediment and slowly uncovered by erosion. Wādī al-Ḥītān provides evidence of coastal marine life that existed millions of years ago.

Fossils

Wādī al-Ḥītān is a key place in the world for showing an important change in Earth’s history: the evolution of whales. It clearly shows how whales lived and looked as they changed from land animals to ocean animals. This site has more, better, and more concentrated fossils than other similar places. The fossils are easy to reach and are found in a beautiful and protected area. The area has a special group of fossils, including skeletons of early whales (called Archaeoceti), sea cows, reptiles, and shark teeth from the Gehannam Formation, which is about 40 to 41 million years old. The rock layers in Wādī al-Ḥītān are from the Middle Eocene epoch and cover a 200 km (77 sq mi) area. Many fossils are found here, and most are well preserved. The most noticeable fossils are whale and sea cow skeletons, with over 500 of these fossils recorded. Wādī al-Ḥītān is unusual because it has such a large number of whale fossils (1,500 marine vertebrate skeletons) in a small area.

Whale fossils range from single bones to complete skeletons. Some partial skeletons are displayed in the public area of the park. The two most common whale species are the large Basilosaurus and the smaller Dorudon (3 to 5 meters long). At least two other whale species are known from less common remains. These whales had small hind legs, which modern whales do not have, and strong skulls with teeth like those of land carnivores. Other mammals include three species of sirenia, or sea cows. These animals lived fully in the ocean like whales and had features not seen in modern sea cows. Their teeth suggest they ate seagrass and other ocean plants. Fossils of the early elephant Moeritherium have also been found.

Fossils of reptiles include crocodiles, sea turtles, and sea snakes. Many types of bony fish, sharks, and rays are present, but most fossils are small teeth that are not easily seen. Larger fish fossils include parts of sawfish, such as a 1.8-meter-long sawfish rostrum displayed in the park. Fossil shells are not common in the main whale area but are found in other rocks. Many rocks are full of different types of fossil shells. Disc-shaped nummulite fossils are often seen on the desert floor. A large log in the park is filled with tubular shipworm fossils. Some fossil seagrass remains have also been found.

In 2021, the oldest known pelican fossil (from the late Eocene) was discovered at Wādī al-Ḥītān.

Geology

The geology of the valley creates the landscape, with wind and water erosion forming impressive cliffs and buttes. The rocks in Wādī al-Ḥītān are from the Middle to Late Eocene period and are made up of three main rock types. The Gehannam Formation consists of open marine mudstones, which are mostly found on the flatter land to the east of the public park. The rock layer containing most of the whale fossils is the Birket Qarun Formation. This layer is made of yellowish open marine sandstones that form most of the cliffs and buttes.

The uniformity of these sandstones is interrupted by a white layer filled with well-preserved animal burrows (once thought to be mangrove roots) and a layer of black mudstone above it. When following the cliffs of the Birket Qarun Formation eastward, they are replaced by Gehannam Formation mudstones, showing a change in water depth from shallower to deeper in that direction. The tops of the higher cliffs belong to the Qasr el Sagha Formation, which includes dark mudstones alternating with limestones containing many shells. This layer represents a lagoonal environment.

Wildlife

Wādī al-Ḥītān has 15 species of desert plants, sand dunes, and around 15 kinds of wild mammals, including the Egyptian wolf, red fox, African leopard, Egyptian mongoose, African wildcat, Cape hare, caracal, striped hyena, and dorcas gazelle. Fennec foxes are the most frequently seen mammals and often come to the campsite at night. Additionally, 19 species of reptiles and 36 species of birds that nest there are drawn to the lakes at Wadi El Rayan.

Tourism

Only about 1,000 visitors each year drive into Wādī al-Ḥītān using four-wheel drive vehicles because the road is unpaved and crosses desert sands that are not marked. Most visitors to Wādī al-Ḥītān are foreigners who usually camp in the valley during winter weekends. Since Wādī al-Ḥītān is part of the Wadi El Rayan Protected Area, a management plan for the area requires visitors to take guided tours on a set path. Sustainable tourism is growing in the region, and four-wheel drive vehicles are being replaced by walking or camel treks.

Part of Wādī al-Ḥītān has been turned into a tourist area. Walkways between major fossils have been built, and small shelters are now present. This public park is regularly visited by tourist groups, and a small campsite is available.

The valley is located behind a mountain called Garet Gohannam, which means "the Mountain of Hell." When the sun sets, the mountain appears to glow with a strange red light.

In July 2007, a pair of cars driven by Belgian diplomats entered a protected area in Wādī al-Ḥītān and damaged part of a whale fossil, causing $10 million in damage. The Belgian government claims no damage was caused by its diplomats. The situation remains unresolved.