Ebro

The Ebro is a very long river.

It starts in the mountains in Spain. The water flows east toward the sea.

It flows through many cities. The river is the longest one in Spain.

It is very important to the land.

In some places, the water moves fast. It goes through rocky gaps.

In other places, the water moves slow.

The river ends at a place called a delta. This is where it meets the sea.

Many birds live in this wet land.

Farmers use the water to grow food. It helps plants like rice grow well. The river is a busy place.

The Ebro is a very important river in Spain.

It starts in the Cantabrian Mountains at a place called Fontibre. From there, the water flows east and southeast. It is the longest river that stays entirely inside Spain.

The river flows through many different cities. It passes through places like Zaragoza and Logroño. In some parts, the river moves through rocky gaps called gorges.

These cliffs look very grand and steep.

The weather near the river can be quite extreme. Summers are often very hot and dry. Winters can be very cold with snow. The river brings water to many dry areas. Farmers use this water to grow rice and fruit.

At the end, the river meets the Mediterranean Sea. It forms a large, wet area called a delta. This delta is a special home for many animals. Over 300 kinds of birds live in these marshes. The delta is also a protected natural park. It is one of the largest wetlands in the area.

The Ebro is a very important river in Spain.

It is the longest river that stays entirely inside the country. It starts high up in the Cantabrian Mountains at a place called Fontibre. From there, the water flows east and southeast toward the sea. The river is the second longest in the Iberian Peninsula. It only follows the Tagus river in length.

This river is a huge part of the land it touches.

As the river travels, it changes how it moves. Near its start, it rushes through rocky gaps called gorges.

When it reaches La Rioja and Navarre, it makes a wider valley. The river grows larger as it picks up water from other streams. Many of these streams come from the Pyrenees mountains. These mountains sit on the border with France. In the spring, melting snow makes the river flow even more. This extra water helps fill the wide valley.

People have lived near the Ebro for a very long time. In ancient times, the river was a border between the Romans and the Carthaginians. The Greeks and Romans gave the river names that led to its current name. One old monastery, the Monastery of Our Lady of the Wheel, was built in 1202. It even used a large waterwheel to make power. Later, the river was part of a famous battle in the Spanish Civil War. This was called the Battle of the Ebro in 1938.

The weather around the Ebro can be quite extreme. The valley is surrounded by mountains that block the sea air. This makes the summers very hot and the winters very cold. In the summer, temperatures can go over 40 degrees Celsius. In the winter, it can drop below 0 degrees Celsius. Because it is often dry, many plants need special help to grow. Some areas use irrigation to bring water to crops. Other plants rely on thick fog to stay wet.

At the very end, the river reaches the Mediterranean Sea. It forms a massive, wet area called a delta. This delta is made of soil that the river washed down from the mountains. It is a very important home for many living things. Over 300 different kinds of birds live in these marshes and beaches.

People also use the delta to grow rice, fruit, and vegetables. It is now a protected natural park to keep it safe.

The Ebro is a vital river system located in the north and northeast of the Iberian Peninsula. It is situated entirely within Spain, making it the longest river in the country.

While the Tagus is longer, the Ebro is the second longest river on the peninsula. It also ranks second in terms of discharge volume and drainage basin size, following the Douro. The river begins its journey in the Cantabrian Mountains at a place called Fontibre. From this high source, the water flows almost entirely in an east-southeast direction. Eventually, the river reaches the Mediterranean Sea by forming a massive delta in southern Catalonia.

The river's journey involves several distinct physical stages. In its upper reaches, the Ebro rushes through rocky gorges in the Burgos Province. As it moves into La Rioja and Navarre, the landscape changes. The river begins to form a wider valley among limestone rocks. This limestone is part of a large bedrock formed from an ancient seabed. In these areas, karst geological processes have shaped the terrain. Karst refers to landscapes formed by the dissolving of soluble carbonate rocks. As the river continues through Aragon, the valley expands. The water volume increases as larger tributaries discharge into the main channel. This increase is especially noticeable during the spring thawing season when mountain snow melts.

The Ebro basin experiences a complex Mediterranean and continental climate. Because the valley is isolated from sea air by surrounding mountains, it faces extreme seasonal contrasts. Summers are often semiarid and very hot. Temperatures can exceed 40°C and occasionally rise above 45°C. In contrast, winters can be very cold, with temperatures often dropping below 0°C. The valley receives annual rainfall between 400 and 600 mm, with peaks in the fall and spring. In some dry areas, plants depend on moisture from condensation fog to survive. The soil in the plains is often thin and organically poor. This subsoil consists of calcareous, pebbly, and stony layers that drain water quickly.

Diverse ecosystems thrive within these various climate zones. The river supports Mediterranean forests, woodlands, and scrublands. In the hinterlands, you can find extensive sclerophyll shrublands known as maquis or garrigues. These areas are dominated by species like *Quercus coccifera* and *Quercus ilex*. As the climate becomes more continental and dry, the vegetation changes again. It shifts from slow-growing dwarf junipers to unvegetated desert steppes, such as the Calanda desert. The river also creates specialized habitats in endorheic lagoons. These are inland bodies of water that do not flow to the sea. In these salty zones, halophiles, or salt-loving organisms, are very common.

Human history is deeply connected to the Ebro's path. In antiquity, the river served as a major dividing line. It separated Roman expansion in the north from Carthaginian expansion in the south. The river's name is ancient; the Greeks called it *Ibēr* and the Romans called it *Hibēr*. This name even gave the Iberian Peninsula its title. In 1202, the Real Monasterio de Nuestra Señora de Rueda was established on its banks. This monastery was technologically advanced for its time. It used a large waterwheel to produce power and created a hydrological central heating system. More recently, the river was the site of the Battle of the Ebro in 1938 during the Spanish Civil War.

Modern management of the river has significantly changed its natural flow. Three massive dams—Mequinenza, Riba-roja, and Flix—have been built to regulate the water.

While these help with water use, they have caused the mean annual flow to decrease by about 29 percent during the 20th century. This reduction affects the sediment load, which has dropped by more than 99 percent. This lack of sediment is a major concern for the Ebro Delta. Without new soil being washed downriver, the coastline faces increased erosion. Additionally, lower water levels allow a "salt wedge" to move further up the river. This occurs when saltwater from the sea pushes into the freshwater estuary.

The Ebro Delta is one of the largest wetlands in the western Mediterranean. It covers approximately 330 km² in the Terres de l'Ebre region. The delta is built entirely from sediments washed down by the river over time.

Today, the area is used for intensive agriculture, including rice, citrus, and vegetables. It is also a vital ecological site, providing habitat for over 300 species of birds. To protect these natural resources, Spain designated the area as the Ebro Delta Natural Park in 1983. A network of canals and irrigation ditches helps maintain both the economy and the ecology of this unique landscape.