 The Motagua River, whose principal head stream is called the Rio Grande, has a course of about 250 miles, and is navigable to within 90 miles of Guatemala City, which is situated on one of its confluents, the Rio de las Vacas.It empties in the Gulf of Honduras, an arm of the Caribbean.Of similar importance is the Polochic River, which is about 180 miles in length, and navigable about 20 miles above the river-port of Telemán.