International Boundary Marker facts for kids

International Boundary Marker
U.S. National Register of Historic Places
International Boundary Marker in 2017
International Boundary Marker Location in Texas Show map of Texas International Boundary Marker Location in Louisiana Show map of Louisiana International Boundary Marker Location in the United States Show map of the United States
Location	On Louisiana-Texas state line, at intersection of FM 31 and LA 765
Nearest city	Deadwood, Texas, Logansport, Louisiana
Area	3 acres (1.2 ha)
Built	1840 (1840)
NRHP reference No.	77001463
Quick facts for kids Significant dates
Added to NRHP	April 13, 1977

The International Boundary Marker, also known as the Republic of Texas Granite Marker, is a boundary marker located on the Louisiana-Texas border near the junction of Texas FM 31 and Louisiana Highway 765, southeast of Deadwood, Texas. The marker was created in 1840 and placed in 1841 to mark the international border between the United States and the Republic of Texas. The survey which established this border lasted from May 1840 to June 1841; the survey team faced hazardous, swampy conditions in their work and were forced to take several extended breaks due to weather and a lack of funding. The boundary marker is the only marker remaining from the Texas border survey and is one of only two known international boundary markers located entirely within the United States (the other being a much older and humbler stone near Mobile, Alabama).

The property of the 3 acres (1.2 ha) area is shared between DeSoto Parish, Louisiana (1 acre) and Panola County, Texas (2 acres), with the marker itself being a direct property of U.S. Government

The marker was added to the National Register of Historic Places on April 13, 1977. In 1980, the marker was designated as a State Historic Civil Engineering Landmark by the Texas and Louisiana Sections of the American Society of Civil Engineers.