The municipality is divided into two (three if the Capital Tumeremo section is counted) parishes; Dalla Costa and San Isidro.

[2] Its first settlers were Guayan Indians and Kamaracotos, coming from the savanna of the Divina Pastora and Tupuquen located to the left margin of the river Yuruari.

During the Campaign of Guayana, General Manuel Piar fights against the realists to seize the missions of the kingdom of Spain.

In 1894, a group of British settlers who came from the British Guyana tried to take part of the present municipal territory, before which General Domingo Antonio Sifontes founded in March 2nd of the same year the population of El Dorado in which it established a military position, then expelled the settlers from the area.

[7] Common birds include the Orange-winged Parrot (Amazona amazonica), Painted Parakeet (Pyrrhura picta), White Bellbird (Procnias alba), Helmeted Pygmy-Tyrant (Lophotriccus galeatus), Fiery-shouldered Parakeet (Pyrrhura egregia), Blue-headed Parrot (Pionus menstruus).