The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whales . At up to 29.9 metres (98 ft) in length and with a maximum recorded weight of 173 tonnes (190 short tons) and probably reaching over 181 tonnes (200 short tons), it is the largest animal known to have ever existed.
According to the United States Census Bureau, the city has a total area of 5.1 square miles (13.1 kmÂ²), of which 5.0 square miles (13.1 kmÂ²) is land and 0.20% is water. Donna is bordered on the east by Weslaco, Texas and on the west by Alamo. The southern boundary of the town is a few miles north of the Rio Grande, the international border between the United States and Mexico. It is 225 miles (362 km) south of San Antonio, Texas.
By 1912 the town was divided into Donna and East Donna. East Donna, the Mexican side of town, had a post office named Beatriz, after Beatriz Hooks, from 1912 to 1916. Saint Joseph Catholic Church and a school for Mexican children were located there.