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The ‘W’ National Park lies 150 km south of Niamey, at the point where Niger, Burkina Faso and Benin meet. Together with the contiguous parks of the same name in Burkina Faso (part of IBA BF008) and Benin (BJ001), it forms the largest tract of protected savanna in West Africa. In the north-east the boundary of the park is formed by the Niger river. The river here makes several sharp turns, which together form the shape of the letter ‘W’ from which the park takes its name. In the south the boundary is formed by the Mékrou river (which also forms the international frontier with Benin), in the west by the international border with Burkina Faso and in the north by the Tapoa river. Large parts of the park are rocky, as a result of outcroppings of metamorphic Precambrian rocks (e.g. quartzites, schists and gneisses). In certain areas, these are overlain by Tertiary sediments, which give rise to widespread laterite-capped plateaus. Along the three rivers there are Quaternary alluvial flood-plains. The vegetation is predominantly wooded savanna and shrubland, transitional between the Sahelian and Sudanian savanna-types, together with a small amount of grassland. In addition to the flood-plains along the Niger river, there are gallery forests along its main tributaries and a number of ephemeral pools and wetlands in upland areas. Average annual rainfall in the park for the period 1961–1990 was c.700 mm.
See Box and Table 2 for key species. At least 355 species of bird have been recorded from the park, of which at least 48 are intra-African wet-season migrants, 63 intra-African dry season migrants and 63 dry-season migrants from Eurasia. Several species of global conservation concern have been recorded. In addition to Circus macrourus, of which more than 30 are likely to be present annually during the northern winter, Falco naumanni is a rare dry-season visitor. There is also a possible observation of Prinia fluviatilis from just north of the park boundary in suitable habitat, which also occurs within the park. Of the Sudan–Guinea Savanna species, Coracias cyanogaster and Galerida modesta are dry-season vagrants while Hypergerus atriceps is a rare dry-season visitor. All other 18 species are proven or likely breeders. The six species of the Sahel biome occur mostly during the dry season and all are uncommon to rare. However this site, together with Makalondi (NE002), are the only IBAs in the non-breeding range of some of the Sahelian species.
Non-bird biodiversity: A total of 82 species of mammal have been identified, including Loxodonta africana (EN), Panthera leo (VU), Acinonyx jubatus (VU), Syncerus caffer (LR/cd) and 11 species of antelope; Trichechus senegalensis (VU) also occurs.
BirdLife International (2017) Important Bird Areas factsheet: 'W' National Park. Downloaded from http://www.birdlife.org on 20/10/2017.