Igarapé Preto is a forest stream and tributary of Rio Moa located near road BR-307 on the outskirts of Cruzeiro do Sul, in the western Acre state of Brazil. The stream's name reflects its most distinctive characteristic: the water is notably dark, stained by the decomposition of organic forest matter. This tannin-rich water runs cooler than most other water bodies in the region, which is a notable contrast given the consistently high ambient temperatures of the Acre lowlands.

The site is developed as a balneário, with an established recreation area accessible via the AC-405 road. Palafitas Bar e Restaurante operates on-site and is open daily from 10am to 5pm. The area draws significant visitor numbers, particularly on weekends and public holidays, when crowding can be substantial.

Safety is a meaningful concern here. The stream is subject to elevated water levels and strong currents, conditions that increase the risk of accidents. In recognition of this, the municipal government of Cruzeiro do Sul stations four lifeguards per shift at the balneário on weekends and holidays, operating from 9am to 5pm. Paddlers should be aware that high-water periods bring notably stronger currents than normal conditions would suggest.

The stream sits within the Rio Juruá drainage basin. The main recreation area is located at approximately 07°35'S, 72°45'W. The surrounding landscape is Amazonian lowland forest. Nearby water bodies of interest to paddlers include Rio Crôa and Rio Yuruá, both accessible from Cruzeiro do Sul.