It is endemic to southern Tanzania and is only known from the Kihansi–Ulanga River floodplain from elevations of 200–500 m (660–1,640 ft) above sea level.

[1][3] It is named after Allen Rees, a principal game warden for the Tanzanian Wildlife Department[4] who collected the type series.

[2] The holotype, an adult male, measures 57 mm (2.2 in) in snout–urostyle length.

[2] Presumably the habitat of this species is floodplain grassland and the tadpoles are aquatic.

It is present in the poorly protected Kilombero Game Controlled Area.