La Sal del Rey

Tucked away just northeast of Edinburg, La Sal del Rey is one of the most unique and historically rich natural landmarks in the Rio Grande Valley (RGV). Part of the Lower Rio Grande Valley National Wildlife Refuge, this shallow salt lake is both a scenic destination and a fascinating site of natural and cultural significance—making it a great option for anyone looking for outdoor activities or hidden gems in South Texas. 

🌬️ Formed by Nature, Shaped by Time

La Sal del Rey lies in a wind-carved depression formed over 10,000 years ago during the Pleistocene-Holocene transition. Groundwater beneath the area is highly saline, and after periods of heavy rainfall, the basin fills to form a lake. With no natural outlet, the water slowly evaporates over time, leaving behind a thick, bright white salt crust.

Depending on the season, visitors may find the lake completely dry with dazzling salt flats stretching out in every direction, or partially filled with shallow water no more than a meter deep. As the water evaporates, salt crystals begin to form, cracking and pushing up the crust into natural ridges—a unique geological phenomenon you can see up close.

In late summer, the salt surface may appear pink due to Halobacterium, a salt-loving microbe that thrives in highly saline conditions. The edges of the lake are also known to host Artemia salina (brine shrimp) eggs, making it an interesting spot for nature and science enthusiasts alike.

🏞️ A Walkable, Wildlife-Friendly Destination

La Sal del Rey is open to the public year-round and is easily accessible through the southern entrance off TX-186. From the parking area, it’s a short and easy 1.6 km (1 mile) hike to the lake. Along the way, visitors may encounter native South Texas wildlife, including birds, butterflies, and small mammals. It’s a peaceful place for birdwatching, photography, or simply enjoying the quiet natural landscape.

The area is part of a protected wildlife refuge, so while exploring is encouraged, it’s important to respect the natural habitat. Walking on the salt flats is permitted, and visitors can observe the formation of salt crystals, selenite (gypsum) crystals, and the lake’s ever-changing surface.

⛏️ A Site Steeped in History
La Sal del Rey isn’t just a natural marvel—it’s also historically significant. Indigenous peoples have been gathering salt from this lake for centuries. In the 1700s, under Spanish rule, it was a notable source of “The King’s Salt,” used for trade throughout New Spain. During the U.S. Civil War, the state of Texas mined salt from the lake to support war efforts. The salt trade continued well into the 20th century and played a role in shaping the region’s economy.

Unlike its neighboring salt lakes—La Sal Vieja and Laguna Salada, which are on private land—La Sal del Rey is the only public-access salt lake in the area, making it a rare opportunity to explore this part of the Valley’s natural and cultural history firsthand.

📍 Plan Your Visit
Location: Off TX-186, northeast of Edinburg, TX

Trail Length: Approx. 1 mile hike from parking to lake

Best Time to Visit: Fall through spring for cooler weather and visible salt formations

What to Bring: Comfortable shoes, water, sun protection, and a camera

🧭 A Must-See Natural Landmark in the RGV

If you’re looking for things to do in the Rio Grande Valley, a visit to La Sal del Rey is a refreshing break from the usual. Whether you’re into geology, wildlife, photography, or Texas history, this one-of-a-kind salt lake offers a peaceful outdoor experience with a story to tell.

It’s a reminder of the rich natural diversity right here in South Texas—no crowds, no noise—just nature, salt, and sky.