Spanish Explorers
Pecos, Reeves County, Texas
Marker Inscription
Antonio De Espejo in 1583, after exploring among pueblos in New Mexico, reached the Pecos River southeast of Santa Fe. He Named it Rio de Las Vacas (river of cows), for the abundance of buffalo. On his return route to Mexico he went down the river to near the present town of Pecos. Jumano Indians led his party to their camp on Toyah Lake. He then went down Toyah Creek and through the Big Bend. While Espejo was first to explore the Pecos, Castano de Sosa, on his way into New Mexico in 1590, was the first European to travel its full length. (1966)
Erected by Texas Historical Commission
The Story
Long before permanent settlement, Spanish explorers probed the country along the Pecos. In 1583 Antonio de Espejo, returning from the New Mexico pueblos, reached the river and named it Río de las Vacas for the great buffalo herds; guided by Jumano Indians to their camp on Toyah Lake, he followed the waters down toward the Big Bend. Seven years later, Castaño de Sosa became the first European to travel the Pecos its full length on his own march into New Mexico.
Why it matters
These expeditions mark the earliest European reconnaissance of West Texas, opening the routes and naming the land that Spain would claim generations before Anglo settlement.
The story behind this marker
AI contextThe era
In the late 1500s, Spain's empire in the Americas was centered on Mexico, and the vast lands to the north were known mostly by rumor. Earlier expeditions had crossed parts of the Southwest, and stories of the pueblo peoples of the upper Rio Grande kept drawing Spanish explorers, missionaries and fortune-seekers north.
The Pecos River country of West Texas was not empty during these years. It was home to Native peoples, including the Jumano, who were traders and travelers themselves and knew the waterways, springs and trails of this dry region very well. Buffalo ranged widely enough that the Spanish noticed their numbers immediately.
All of this happened decades before Spain set up a permanent colony in New Mexico, and long before Santa Fe was founded. The marker uses Santa Fe only as a modern landmark. At the time of these expeditions the town did not yet exist. These were probing journeys into a land Spain claimed but had barely seen.
People & events
Antonio de Espejo led an expedition north from Mexico in the early 1580s and traveled among the pueblos of New Mexico. In 1583, on his way home, he reached the Pecos River southeast of where Santa Fe now stands. The herds of buffalo along its banks impressed him so much that he named it the Río de las Vacas, the River of Cows. That was the Spanish way of describing the unfamiliar animals.
Espejo followed the river downstream toward the site of present-day Pecos, Texas. Jumano guides then led his party to their camp at Toyah Lake. His route continued down Toyah Creek and through the Big Bend country on the way back to Mexico. The Jumano's knowledge of the land made the journey possible, and that is easy to overlook in stories that credit only the Europeans.
Seven years later, in 1590, Gaspar Castaño de Sosa marched the other direction, heading into New Mexico. According to the marker, he became the first European to travel the full length of the Pecos. So Espejo was the first to explore the river, and Castaño de Sosa was the first to follow it all the way.
Its place in the American story
These expeditions are some of the earliest European encounters with the land that became Texas and the American Southwest. They came long before English colonists settled Jamestown. They also show that the continent's colonial story did not only move west from the Atlantic. It moved north from Mexico, carrying Spanish names, maps and claims into the heart of the region.
The Pecos itself became one of the great dividing lines of Texas. Much later, 'west of the Pecos' came to mean the wildest and most remote country in the state. The first written European descriptions of that river go back to explorers like Espejo and Castaño de Sosa.
This marker is also a reminder that Native nations like the Jumano shaped these journeys at every step. They served as guides and hosts, and they held knowledge the newcomers lacked. The meeting of Spanish ambition and Indigenous expertise along the Pecos is an early chapter in a story of contact, exchange and conflict that ran through centuries of American history.
If you visit
Stand here and picture this country with the buffalo herds that gave the river its Spanish name. The land around Pecos is wide and open, and it is easy to imagine small parties of riders and their guides moving slowly across it, watching for water.
The marker makes a good jumping-off point for a West Texas road trip. The explorers' route ran from the Pecos toward the Toyah area and on into the Big Bend, which means you can roughly follow their path across some of the most dramatic landscapes in Texas.
Bring water, watch the weather and give yourself time. Distances out here are long and services can be far apart. That is part of the appeal, and it will give you some sense of what these early travelers were up against.
Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.
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Related people
- · Antonio de Espejo
- · Castaño de Sosa
Themes & tags
Nearby & related markers
Reeves County-Pecos, Texas
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