1. Reservoirs
With the exception of Caddo, all of the lakes in Texas are reservoirs, which are artificial lakes used to store water.
Reservoirs may be created in river valleys by the construction of a dam, or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.

2. Reservoirs
As late as 1913, Texas had only four major reservoirs with a total storage capacity of 277,600 acre-feet. By January 2011, Texas had 187 major reservoirs (those with a normal capacity of 5,000 acre-feet or larger), not counting four that are normally dry and six reservoirs made up of proximate impoundments.
According to the U.S. Statistical Abstract of 2010, Texas has 5,607 square miles of inland water, ranking it first in the 48 contiguous states, followed by Florida, with 5,373 sq. mi.; Minnesota, 4,782; and Louisiana, 4,433.
There are about 6,736 reservoirs in Texas with a normal storage capacity of 10 acre-feet or larger.

3. Reservoirs
Lake Mead is the largest reservoir in the United States in maximum water capacity. It is located on the Colorado River about 24 mi (39 km) from the Strip southeast of Las Vegas, Nevada, in the states of Nevada and Arizona. Formed by the Hoover Dam, Lake Mead is 112 miles (180 km) long when the lake is full, has 550 miles (890 km) of shoreline, is around 500 feet at greatest depth, has 247 square miles (640 km2) of surface, and when filled to capacity, 28 million acre-feet of water. However, the lake has not reached this capacity in more than a decade, due to increasing droughts.

4. Swamps
A swamp is a wetland that is forested. Many swamps occur along large rivers, where they are critically dependent upon natural water level fluctuations. Other swamps occur on the shores of large lakes. Some swamps have hammocks, or dry-land protrusions, covered by aquatic vegetation, or vegetation that tolerates periodical inundation. The two main types of swamp are "true" or swamp forests and "transitional" or shrub swamps. Some of the world's largest swamps are found along major rivers such as the Amazon, the Mississippi, and the Congo.
Swamps are characterized by very slow-moving waters. They are usually associated with adjacent rivers or lakes. In some cases, rivers become swamps for a distance. Swamps are features of areas with very low topographic relief.

5. Swamps can be found on all continents except Antarctica.
The largest swamp in the world is the Amazon River floodplain, which is particularly significant for its large number of fish and tree species.

6. Swamps
Atchafalaya Swamp at the lower end of the Mississippi River is the largest swamp in the United States. It is an important example of southern cypress swamp, but it has been greatly altered by logging, drainage and levee construction.

7. The Everglades in Florida
Swamps
The Everglades in Florida

8. Okefenokee Swamp on the Florida-Georgia border
Swamps
Okefenokee Swamp on the Florida-Georgia border