The Cross River forms a boundary between two tropical moist forest ecoregions: the Cross-Niger transition forests, which lie west of the river between the Cross and Niger Rivers, and the Cross-Sanaga-Bioko coastal forests, which lie to the east between the Cross River and the Sanaga River of Cameroon. The average annual rainfall varies from 1,760 mm in the northern part of the state to 3,100 mm in the southern part (WSSSRP II 2016).
Cross River also gives its name to a national park and a family of languages. The Cross River Region is of great historical importance, being a) within the likely homeland from which Bantu speaking people migrated across most of Sub-Saharan Africa 3000–5000 years ago, b) the location of where the Nsibidi Script was created, and c) the location of Calabar, one of the largest centers during the Atlantic slave trade.
Pollution During some months of monitoring, iron, manganese, lead, arsenic, and chromium were identified in the water at levels hazardous for drinking; thus, the water was polluted with these heavy metals and could not be relied on to serve as a potable water supply for Nigerians.
References External links Nigerian Tourism, Cross Rivers State Little genetic differentiation as assessed by uniparental markers in the presence of substantial language variation in peoples of the Cross River region of Nigeria Nsibidi Script